Enable Position Independent Code and inherit CFLAGS from the build system. FYI: The package fails to build on SLE_12_SP5 and I'm not sure why. OBS-URL: https://build.opensuse.org/request/show/885313 OBS-URL: https://build.opensuse.org/package/show/devel:libraries:c_c++/giflib?expand=0&rev=53