Created attachment 579684 [details, diff] Remove -Werror from IGC's CMakeLists.txt IGC rather unfortunately enables -Werror on their CMakeLists, which means the compilation often fails. This patch disables -Werror.
I'm submitting this since compiling IGC 1.0.8 fails due to some alloca warning.
Might as well, IMHO unconditionally upgrading all possible warnings to errors *is* excessive in a release. I'll add your patch to the 1.0.9 ebuild, which I shall push into the tree shortly.