mac compile issues

I was trying to do a pip install quisk and this then needed a compile linking to FFTW3

Error message was a typical "file not found" for a system header file .... fftw3.h

#include <fftw3.h>

Brew Package is there

The package was there - but just in case

brew install fftw

Still the same error.

Alter Search path

As the System compile/look search path does not inlude local/ libraries

I then DID

export DYLD_LIBRARY_PATH=/usr/local/lib
export LDFLAGS="-L/usr/local/include"
export CFLAGS="-I/usr/local/include 

To Disable C-Compiler warnings use

export CFLAGS="-I/usr/local/include -w"

-Wall

All Warnings !!

-Wreturn-type

Just Return-Type Warning