Gentoo issue: https://bugs.gentoo.org/900148
Upstream issue: https://gitlab.gnome.org/GNOME/gimp/-/issues/9452

diff -Naur a/app/core/gimpbacktrace-backend.h b/app/core/gimpbacktrace-backend.h
--- a/app/core/gimpbacktrace-backend.h
+++ b/app/core/gimpbacktrace-backend.h
@@ -22,7 +22,7 @@
 #define __GIMP_BACKTRACE_BACKEND_H__
 
 
-#ifdef __gnu_linux__
+#if defined (__gnu_linux__) && defined (__GLIBC__)
 # define GIMP_BACKTRACE_BACKEND_LINUX
 #elif defined (G_OS_WIN32) && defined (ARCH_X86)
 # define GIMP_BACKTRACE_BACKEND_WINDOWS