How to override environment variables when running configure?
autotools, configure, environment-variables, include
Solution
These are not flags passed to configure. These are environment variables you need to set. e.g. `export CFLAGS="-I foo"`.
Problem
In any major package for Linux, running `./configure --help` will output at the end: ``` Some influential environment variables: CC C compiler command CFLAGS C compiler flags LDFLAGS linker flags, e.g. -L<lib dir> if you have libraries in a nonstandard directory <lib dir> CPPFLAGS C/C++ preprocessor flags, e.g. -I<include dir> if you have headers in a nonstandard directory <include dir> CPP C preprocessor Use these variables to override the choices made by `configure' or to help it to find libraries and programs with nonstandard names/locations. ``` How do I use these variables to include a directory? I tried running `./configure --CFLAGS="-I/home/package/custom/"` and `./configure CFLAGS="-I/home/package/custom/"`, however these do not work. Any suggestions?