diff -Naur gzdoom-g1.9.1/game-music-emu/CMakeLists.txt gzdoom-g1.9.1.patched/game-music-emu/CMakeLists.txt
--- gzdoom-g1.9.1/game-music-emu/CMakeLists.txt	2016-02-23 05:34:50.000000000 -0500
+++ gzdoom-g1.9.1.patched/game-music-emu/CMakeLists.txt	2021-10-09 15:42:40.090569168 -0400
@@ -84,7 +84,7 @@
    if (__LIBGME_TEST_VISIBILITY)
       # get the gcc version
       exec_program(${CMAKE_CXX_COMPILER} ARGS --version OUTPUT_VARIABLE _gcc_version_info)
-      string (REGEX MATCH "[3-9]\\.[0-9]\\.[0-9]" _gcc_version "${_gcc_version_info}")
+      string (REGEX MATCH "[1-9][0-9]*\\.[0-9]\\.[0-9]" _gcc_version "${_gcc_version_info}")
 
       # gcc <4.1 had poor support for symbol visibility
       if ((${_gcc_version} VERSION_GREATER "4.1") OR (${_gcc_version} VERSION_EQUAL "4.1"))