--- firefox-a9196d32a914f0bcf6b76168b83c70e61bc90980/build/moz.configure/toolchain.configure.old
+++ firefox-a9196d32a914f0bcf6b76168b83c70e61bc90980/build/moz.configure/toolchain.configure
@@ -983,7 +983,7 @@
         elif host_or_target.kernel == "WASI":
             supported = types = ("clang",)
         else:
-            supported = types = ("clang", "gcc")
+            supported = types = ("gcc",)
 
         info = other_c_compiler[0] if other_c_compiler else None