https://bugs.gentoo.org/898590
https://src.fedoraproject.org/rpms/autogen/c/7d157d98e73dcd1602111309a690643faa80e207?branch=rawhide
--- a/config/ag_macros.m4
+++ b/config/ag_macros.m4
@@ -113,7 +113,7 @@ AC_DEFUN([INVOKE_AG_MACROS_LAST],[
   fi
 
   AC_CACHE_CHECK([for static inline], [snv_cv_static_inline], [
-  AC_TRY_COMPILE([static inline foo(bar) int bar; { return bar; }],
+  AC_TRY_COMPILE([static inline int foo(bar) int bar; { return bar; }],
     [return foo(0);],
     [snv_cv_static_inline='static inline'],
     [snv_cv_static_inline='static'])
@@ -428,7 +428,7 @@ int main (int argc, char ** argv) {
    char zRej@<:@@:>@ = reject;
    char zAcc@<:@@:>@ = "a-ok-eject";
    return strcspn( zAcc, zRej ) - 5;
-}] )]
+}] )],
     [ag_cv_run_strcspn=yes],[ag_cv_run_strcspn=no],[ag_cv_run_strcspn=no]
   ) # end of RUN_IFELSE
   ]) # end of AC_CACHE_VAL for ag_cv_run_strcspn
--- a/configure
+++ b/configure
@@ -17338,7 +17338,7 @@ int main (int argc, char ** argv) {
    char zAcc[] = "a-ok-eject";
    return strcspn( zAcc, zRej ) - 5;
 }
-    ag_cv_run_strcspn=yes
+#error
 _ACEOF
 if ac_fn_c_try_run "$LINENO"; then :
   ag_cv_run_strcspn=no
@@ -18406,7 +18405,7 @@ else
 
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-static inline foo(bar) int bar; { return bar; }
+static inline int foo(bar) int bar; { return bar; }
 int
 main ()
 {
