Fedora sent upstream by email: https://bugzilla.redhat.com/show_bug.cgi?id=2148432#c2.

https://src.fedoraproject.org/rpms/perl-Curses/c/2633f3adcd14dff61d6d45f97c8bc4f65ce06d82?branch=rawhide
Add missing int types for C99 compatibility.
--- a/testint.c
+++ b/testint.c
@@ -8,6 +8,7 @@
 
 #include "c-config.h"
 
+int
 main() {
   int ret;
 
--- a/testtyp.c
+++ b/testtyp.c
@@ -8,6 +8,7 @@
 
 #include "c-config.h"
 
+int
 main() {
   typedef SYM c_sym_t;
 }

--- a/test.syms
+++ b/test.syms
@@ -24,6 +24,9 @@ use warnings;
 use English;
 
 my $verbose;
+my $panels;
+my $menus;
+my $forms;
 
 sub makeCompileCommand($) {
     my ($compileR) = @_;
@@ -74,22 +77,31 @@ sub makeCompileCommand($) {
     #
     #  _C_SYM_ and _C_FILE_ will be filled in later
 
+    my $defs_prefix = '-D';
     if ($OSNAME =~ m{VMS}i) {
-        $compile =~ s{#DEFS#}{DEFINE=SYM="_C_SYM_"};
+	$defs_prefix = 'DEFINE-';
         $compile =~ s{#FILE#}{_C_FILE_.c};
         $compile =~ s{#NULL#}{};  # no non-verbose way
     }
     elsif ($OSNAME eq 'MSWin32') {
-        $compile =~ s{#DEFS#}{-DSYM="_C_SYM_"};
         $compile =~ s{#FILE#}{_C_FILE_.c};
         $compile =~ s{#NULL#}{>nul 2>&1};
     }
     else {
-        $compile =~ s{#DEFS#}{-DSYM="_C_SYM_"};
         $compile =~ s{#FILE#}{-o _C_FILE_ _C_FILE_.c};
         $compile =~ s{#NULL#}{>/dev/null 2>&1};
     }
 
+    # Make these defines from CursesDef.h available early, so that
+    # the feature probing uses the correct build configuration.
+    my @defs = (qq(${defs_prefix}SYM="_C_SYM_"));
+    push @defs, qq(${defs_prefix}C_PANELFUNCTION="1") if $panels;
+    push @defs, qq(${defs_prefix}C_MENUFUNCTION="1") if $menus;
+    push @defs, qq(${defs_prefix}C_FORMFUNCTION="1") if $forms;
+
+    $compile =~ s{#DEFS#}{join " ", @defs}e;
+    
+
     if ($compile =~ m{#.+#}) {
         die "OOPS: internal error constructing a compile command.  " .
             "We failed to substitute for a #xxx# substitution variable " .
@@ -109,10 +121,6 @@ print("Set CURSES_VERBOSE environment variable to see the details of the " .
       "tests.\n");
 print("\n");
 
-my $panels;
-my $menus;
-my $forms;
-
 if ($ENV{CURSES_VERBOSE}) {
     $verbose = 1;
 } else {