autoconf failure with INSTALL_LOCATION=

[mdavidsaver]

Trying to configure pvaPy with INSTALL_LOCATION given

tar -xaf EPICS-CPP-4.6.0.tar.gz
cd EPICS-CPP-4.6.0/
make -j4 EPICS_BASE=/home/mdavidsaver/work/epics/base-git INSTALL_LOCATION=$PWD/root
make -j4  EPICS_BASE=/home/mdavidsaver/work/epics/base-git INSTALL_LOCATION=$PWD/root config.pvaPy
make -j4  EPICS_BASE=/home/mdavidsaver/work/epics/base-git INSTALL_LOCATION=$PWD/root pvaPy

checking for boostlib >= 1.40... yes
configure: Using boost version 105500
checking whether the Boost::Python library is available... yes
checking for exit in -lboost_python... yes
checking for Boost.NumPy library... no
checking how to run the C++ preprocessor... g++ -E
checking for EPICS base directory /home/mdavidsaver/work/epics/base-git... yes
checking for EPICS Base version >= 3.14.12... yes
checking for EPICS Base libraries for linux-x86_64... yes
checking for EPICS4 directory /home/mdavidsaver/work/epics/EPICS-CPP-4.6.0... no
configure: error: "could not find pvAccess installation: no header file /home/mdavidsaver/work/epics/base-git/include/epicsVersion.h"
Makefile:46: recipe for target 'configure' failed
make[1]: *** [configure] Error 1
make[1]: Leaving directory '/home/mdavidsaver/work/epics/EPICS-CPP-4.6.0/pvaPy'
Makefile:140: recipe for target 'pvaPy/configure/RELEASE.local' failed
make: *** [pvaPy/configure/RELEASE.local] Error 2

The epicsVersion.h header does exist at the location mentioned

$ ls /home/mdavidsaver/work/epics/base-git/include/epicsVersion.h
/home/mdavidsaver/work/epics/base-git/include/epicsVersion.h