Cannot find dependency headers when trying to install C-based Python package (pylibmc)

[richardcooper]

Describe the bug

Using a Python venv in a devshell it is not possible to install pylbmc, which is the Python wrapper around libmemcached. I've installed the dependencies of pylibmc (libmemcached& zlib) in the devshell, but the pylibmc installer cannot find the libmemcached headers.

To Reproduce

Steps to reproduce the behavior:

1. nix flake new -t "github:numtide/devshell" pylibmc_issue
2. cd pylibmc_issue
3. Edit devshell.toml to have the the following contents

[devshell]
packages = [
  "python39",
  "python39Packages.setuptools",
  "libmemcached",
  "zlib",
]

4. Enter the devshell:nix develop
5. Create a Python virtual environment: python -m venv venv
6. Activate the virtual env: source venv/bin/activate
7. Try to install pylibmc: pip install pylibmc

The result is

(venv) [devshell]$ pip install pylibmc
Collecting pylibmc
  Using cached pylibmc-1.6.1.tar.gz (64 kB)
Using legacy 'setup.py install' for pylibmc, since package 'wheel' is not installed.
Installing collected packages: pylibmc
    Running setup.py install for pylibmc ... error
    ERROR: Command errored out with exit status 1:
     command: /Users/Shared/pylibmc_issue/venv/bin/python -u -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/tmp/pip-install-euc1zud_/pylibmc_6f9f117288b3428bb3deab04c07dbac9/setup.py'"'"'; __file__='"'"'/private/tmp/pip-install-euc1zud_/pylibmc_6f9f117288b3428bb3deab04c07dbac9/setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(__file__) if os.path.exists(__file__) else io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /private/tmp/pip-record-1y1x46u5/install-record.txt --single-version-externally-managed --compile --install-headers /Users/Shared/pylibmc_issue/venv/include/site/python3.9/pylibmc
         cwd: /private/tmp/pip-install-euc1zud_/pylibmc_6f9f117288b3428bb3deab04c07dbac9/
    Complete output (28 lines):
    /private/tmp/pip-install-euc1zud_/pylibmc_6f9f117288b3428bb3deab04c07dbac9/setup.py:98: DeprecationWarning: 'U' mode is deprecated
      with open("README.rst", "U", encoding="utf-8") as r:
    /private/tmp/pip-install-euc1zud_/pylibmc_6f9f117288b3428bb3deab04c07dbac9/setup.py:100: DeprecationWarning: 'U' mode is deprecated
      with open("src/pylibmc-version.h", "U", encoding="utf-8") as r:
    running install
    running build
    running build_py
    creating build
    creating build/lib.macosx-10.6-x86_64-3.9
    creating build/lib.macosx-10.6-x86_64-3.9/pylibmc
    copying src/pylibmc/autoconf.py -> build/lib.macosx-10.6-x86_64-3.9/pylibmc
    copying src/pylibmc/pools.py -> build/lib.macosx-10.6-x86_64-3.9/pylibmc
    copying src/pylibmc/client.py -> build/lib.macosx-10.6-x86_64-3.9/pylibmc
    copying src/pylibmc/__init__.py -> build/lib.macosx-10.6-x86_64-3.9/pylibmc
    copying src/pylibmc/test.py -> build/lib.macosx-10.6-x86_64-3.9/pylibmc
    copying src/pylibmc/consts.py -> build/lib.macosx-10.6-x86_64-3.9/pylibmc
    copying src/pylibmc/__main__.py -> build/lib.macosx-10.6-x86_64-3.9/pylibmc
    running build_ext
    building '_pylibmc' extension
    creating build/temp.macosx-10.6-x86_64-3.9
    creating build/temp.macosx-10.6-x86_64-3.9/src
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3 -Wall -DUSE_ZLIB -I/Users/Shared/pylibmc_issue/venv/include -I/nix/store/z740mapbgfi953b61jx72c0jy3phfcy8-python3-3.9.10/include/python3.9 -c src/_pylibmcmodule.c -o build/temp.macosx-10.6-x86_64-3.9/src/_pylibmcmodule.o -fno-strict-aliasing -std=c99
    In file included from src/_pylibmcmodule.c:34:
    src/_pylibmcmodule.h:42:10: fatal error: 'libmemcached/memcached.h' file not found
    #include <libmemcached/memcached.h>
             ^~~~~~~~~~~~~~~~~~~~~~~~~~
    1 error generated.
    error: command '/usr/bin/clang' failed with exit code 1
    ----------------------------------------
ERROR: Command errored out with exit status 1: /Users/Shared/pylibmc_issue/venv/bin/python -u -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/tmp/pip-install-euc1zud_/pylibmc_6f9f117288b3428bb3deab04c07dbac9/setup.py'"'"'; __file__='"'"'/private/tmp/pip-install-euc1zud_/pylibmc_6f9f117288b3428bb3deab04c07dbac9/setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(__file__) if os.path.exists(__file__) else io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /private/tmp/pip-record-1y1x46u5/install-record.txt --single-version-externally-managed --compile --install-headers /Users/Shared/pylibmc_issue/venv/include/site/python3.9/pylibmc Check the logs for full command output.

Expected behavior

I would expect pylibmc to install without error, as it does if I use Nix without devshell.

Instead of using devshell I can use the following flake.nix file which installs the same packages.

{
  description = "pylibmc";

  inputs = {
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, flake-utils, nixpkgs }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs { inherit system; };
        #pkgs = nixpkgs.legacyPackages.${system};
      in {
        devShell = pkgs.mkShell {
          name = "pylibmc";
          buildInputs = with pkgs; [
            python39
            python39Packages.setuptools
            libmemcached
            zlib
          ];
        };
      }
    );
}

Using that flake.nix file, now steps 4-7 above succeed.

$ python -c "import pylibmc; print(pylibmc.__version__)"
1.6.1

System information

macOS Monterey 12.2.1 on an Intel Mac Nix: 2.6.0 Devshell rev: 7033f64

Additional context

I am aware that nixpkgs contains a python39Packages.pylibmc package which I could use instead of installing pylibmc via pip. The problem is that ultimately I'm trying to use devshell on a large Python application which has many dependencies including multiple C-based packages. Many of those packages don't exist in nixpkgs so unfortunately sticking to only packages installed via nixpkgs is not an option for me.

[jfroche]

pip enables to define extra lib/header directory using environment variables. These packages are installed in the DEVSHELL_DIR directory. This should work:

[devshell]
packages = [
  "python39",
  "python39Packages.setuptools",
  "libmemcached",
  "cyrus_sasl.dev",
  "zlib.dev",
  "zlib",
  "gcc",
]

[[env]]
name = "CPPFLAGS"
eval = "-I${DEVSHELL_DIR}/include"

[[env]]
name = "LDFLAGS"
eval = "-L${DEVSHELL_DIR}/lib"

Note that we need to set the dev output for zlib.dev and cyrus_sasl.dev as packages just takes the default output.

We could ease that process and define an extra language python in devshell to enable this kind of C dependencies for pip (similar to what we do in c.nix). We would end up with something like this:

imports = [
  "language.python"
]

language.python.includes = [
  "zlib",
  "cyrus_sasl",
]

language.python.libraries = [
  "zlib",
  "libmemcached"
]

[devshell]
packages = [
  "python39",
  "python39Packages.setuptools",
]

[yajo]

FTR I was having the same problem and I also had to patch the $LD_LIBRARY_PATH env var. Also, I was writing the configuration directly in nix, so I had to rewrite those ${DEVSHELL_DIR} into $DEVSHELL_DIR to avoid a failure. My intention was to use psycopg2. A code snippet:

  pkgs.devshell.mkShell {
    env = [
      # Disponibilize compile headers and dependencies
      {name="CPPFLAGS"; eval = "-I$DEVSHELL_DIR/include";}
      {name="LDFLAGS"; eval = "-L$DEVSHELL_DIR/lib";}
      {name="LD_LIBRARY_PATH"; eval = "$DEVSHELL_DIR/lib:$LD_LIBRARY_PATH";}
    ];

    packages = with pkgs; [
      # Build dependencies to allow `poetry install`
      openssl.dev
      postgresql.lib
    ];
  };

If I didn't patch $LD_LIBRARY_PATH, I'd get this error:

> python -c 'import psycopg2'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/var/home/yajo/prodevel/example/.venv/lib/python3.8/site-packages/psycopg2/__init__.py", line 51, in <module>
    from psycopg2._psycopg import (                     # noqa
ImportError: libpq.so.5: cannot open shared object file: No such file or directory

[blissdev]

I'm using the same techniques outlined above and am still having issues installing psycopg2 via pip (is that the problem?). My config:

# https://numtide.github.io/devshell
[[commands]]
package = "devshell.cli"
help = "Per project developer environments"

[devshell]
packages = [
    "gcc",
    "openssl",
    "openssl.dev",
    "postgresql",

    # Python
    "python310Full",
    "python310Packages.setuptools",
]

[[env]]
name = "CPPFLAGS"
eval = "-I${DEVSHELL_DIR}/include"

[[env]]
name = "LDFLAGS"
eval = "-L${DEVSHELL_DIR}/lib"

[[env]]
name = "LD_LIBRARY_PATH"
eval = "${DEVSHELL_DIR}/lib:${LD_LIBRARY_PATH}"

but I receive the following when I try to build my venv.

      In file included from psycopg/win32_support.c:28:
      In file included from ./psycopg/psycopg.h:38:
      ./psycopg/config.h:69:13: warning: unused function 'Dprintf' [-Wunused-function]
      static void Dprintf(const char *fmt, ...)
                  ^
      1 warning generated.
      clang -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3 -Wall -I/nix/store/7cmwkhhrhnhwz5bwm3g76df2xa69mr26-devshell-dir/include "-DPSYCOPG_VERSION=2.9.3 (dt dec pq3 ext lo64)" -DPSYCOPG_DEBUG=1 -DPG_VERSION_NUM=140004 -DHAVE_LO64=1 -DPSYCOPG_DEBUG=1 -I/Volumes/Work/erezlife/venv/include -I/nix/store/6n0zvdpam247lq10xfrp35fqmnmkikzx-python3-3.10.5/include/python3.10 -I. -I/nix/store/7cmwkhhrhnhwz5bwm3g76df2xa69mr26-devshell-dir/include -I/nix/store/7cmwkhhrhnhwz5bwm3g76df2xa69mr26-devshell-dir/include/server -I/nix/store/1k3qq40cd22vl8ily5l9ck9n5fi37czn-icu4c-71.1-dev/include -I/nix/store/lg2lxrbwk2gbm74n4kqnqc6jq4326xzr-libxml2-2.9.14-dev/include/libxml2 -I/nix/store/qbynak9nki5ashg1rz5gx8mlf2r8hcs4-lz4-1.9.3-dev/include -c psycopg/xid_type.c -o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/xid_type.o
      clang -bundle -undefined dynamic_lookup -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-zlib-1.2.12/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-bzip2-1.0.8/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-expat-2.4.8/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-xz-5.2.5/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-libffi-3.4.2/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-gdbm-1.23/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-sqlite-3.39.2/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-readline-6.3p08/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-ncurses-6.3-p20220507/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-openssl-1.1.1q/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-tcl-8.6.11/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-tk-8.6.11/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-libX11-1.7.2/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-xorgproto-2021.5/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-configd-453.19/lib -L/nix/store/869c76qhfn4jgbwiqnf6sw5jcc35lv28-tzdata-2022a/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-zlib-1.2.12/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-bzip2-1.0.8/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-expat-2.4.8/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-xz-5.2.5/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-libffi-3.4.2/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-gdbm-1.23/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-sqlite-3.39.2/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-readline-6.3p08/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-ncurses-6.3-p20220507/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-openssl-1.1.1q/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-tcl-8.6.11/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-tk-8.6.11/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-libX11-1.7.2/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-xorgproto-2021.5/lib -L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-configd-453.19/lib -L/nix/store/869c76qhfn4jgbwiqnf6sw5jcc35lv28-tzdata-2022a/lib -L/nix/store/7cmwkhhrhnhwz5bwm3g76df2xa69mr26-devshell-dir/lib -I/nix/store/7cmwkhhrhnhwz5bwm3g76df2xa69mr26-devshell-dir/include build/temp.macosx-10.12-x86_64-cpython-310/psycopg/adapter_asis.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/adapter_binary.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/adapter_datetime.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/adapter_list.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/adapter_pboolean.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/adapter_pdecimal.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/adapter_pfloat.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/adapter_pint.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/adapter_qstring.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/aix_support.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/bytes_format.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/column_type.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/connection_int.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/connection_type.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/conninfo_type.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/cursor_int.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/cursor_type.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/diagnostics_type.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/error_type.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/green.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/libpq_support.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/lobject_int.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/lobject_type.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/microprotocols.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/microprotocols_proto.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/notify_type.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/pqpath.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/psycopgmodule.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/replication_connection_type.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/replication_cursor_type.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/replication_message_type.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/solaris_support.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/typecast.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/utils.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/win32_support.o build/temp.macosx-10.12-x86_64-cpython-310/psycopg/xid_type.o -L/nix/store/6n0zvdpam247lq10xfrp35fqmnmkikzx-python3-3.10.5/lib -L/nix/store/9zzdsi078dfvwk3c8mp0ah4n11qdhbnj-postgresql-14.4-lib/lib -L/nix/store/2bsx47y6a98pwc2dhhva34a8nw4hk4f6-libxml2-2.9.14/lib -L/nix/store/z90ch0v4wddigb5q4vh7r1xz8bffqic5-lz4-1.9.3/lib -lpq -lssl -lcrypto -o build/lib.macosx-10.12-x86_64-cpython-310/psycopg2/_psycopg.cpython-310-darwin.so
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-zlib-1.2.12/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-bzip2-1.0.8/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-expat-2.4.8/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-xz-5.2.5/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-libffi-3.4.2/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-gdbm-1.23/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-sqlite-3.39.2/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-readline-6.3p08/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-ncurses-6.3-p20220507/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-openssl-1.1.1q/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-tcl-8.6.11/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-tk-8.6.11/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-libX11-1.7.2/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-xorgproto-2021.5/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-configd-453.19/lib'
      ld: warning: directory not found for option '-L/nix/store/869c76qhfn4jgbwiqnf6sw5jcc35lv28-tzdata-2022a/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-zlib-1.2.12/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-bzip2-1.0.8/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-expat-2.4.8/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-xz-5.2.5/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-libffi-3.4.2/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-gdbm-1.23/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-sqlite-3.39.2/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-readline-6.3p08/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-ncurses-6.3-p20220507/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-openssl-1.1.1q/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-tcl-8.6.11/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-tk-8.6.11/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-libX11-1.7.2/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-xorgproto-2021.5/lib'
      ld: warning: directory not found for option '-L/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-configd-453.19/lib'
      ld: warning: directory not found for option '-L/nix/store/869c76qhfn4jgbwiqnf6sw5jcc35lv28-tzdata-2022a/lib'
      ld: library not found for -lssl
      clang: error: linker command failed with exit code 1 (use -v to see invocation)
      error: command '/usr/bin/clang' failed with exit code 1
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
error: legacy-install-failure

× Encountered error while trying to install package.
╰─> psycopg2

[yajo]

You seem to be missing postgresql.lib. Check out https://github.com/numtide/devshell/issues/172#issuecomment-1094675420.

[blissdev]

Ah missed that, thanks!