--- potrace-1.16.orig/configure.ac	2019-09-18 12:50:43.155641076 -0400
+++ potrace-1.16/configure.ac	2019-09-18 12:51:00.662534103 -0400
@@ -28,7 +28,7 @@
 dnl figure out compiler options
 
 dnl Check for compiler
-AC_PROG_CC([clang gcc cc c99 mgcc c89 pcc opencc sunc99 suncc])
+AC_PROG_CC([gcc cc c99 mgcc c89 pcc opencc sunc99 suncc clang])
 AC_USE_SYSTEM_EXTENSIONS
 
 dnl Also add CADD to the CFLAGS at configure time or compile time