[macOS] Having trouble linking to Poco installed through Homebrew

With Poco installed through Homebrew I've been trying to compile NymphRPC (And libnymphcast) but it's been failing to find the library. Poco, like everything in Homebrew on my machine, is installed to /opt/homebrew/lib and /opt/homebrew/include (well, available via symlinks there anyway). I can use CXXFLAGS to make the Makefile look in /opt/homebrew/include for the header files but the same seems to be impossible with something like LDFLAGS to tell the linker where the library is.