gentoo-overlay/dev-scheme/elk/files/elk-3.99.8-c99-build-fix.patch

https://bugs.gentoo.org/928675
--- a/lib/xwidgets/xaw/list.c
+++ b/lib/xwidgets/xaw/list.c
@@ -2,15 +2,15 @@
 #include <X11/Xaw/List.h>
 
 
-static const char **Get_List (Object x) {
+static char **Get_List (Object x) {
     register int i, n;
     register char *s;
-    register const char **l;
+    register char **l;
     Alloca_Begin;
 
     Check_List (x);
     n = Fast_Length (x);
-    l = (const char **)XtMalloc ((n+1) * sizeof (char *));
+    l = (char **)XtMalloc ((n+1) * sizeof (char *));
     for (i = 0; i < n; i++, x = Cdr (x)) {
         Get_Strsym_Stack (Car (x), s);
         l[i] = XtNewString (s);
--- a/include/extern.h
+++ b/include/extern.h
@@ -442,7 +442,7 @@ extern Object P_String_Fill (Object, Object);
 extern Object P_Substringp (Object, Object);
 extern Object P_CI_Substringp (Object, Object);
 extern int String_Getc (Object);
-extern void String_Ungetc (Object, register int);
+extern void String_Ungetc (Object, int);
 
 /* Symbols, variables, frequently used Scheme objects
  */