Port to C23, minimal fix to enable rudimentary test
Correct function declaration, use correct type for Window:
X expects that it's value everywhere, with pointer already inside
Return 0 when asked for help, not default 1
https://bugs.gentoo.org/943913
https://bugs.gentoo.org/880965
--- a/wmgeneral/wmgeneral.c
+++ b/wmgeneral/wmgeneral.c
@@ -46,7 +46,7 @@
 char		*Geometry = "";
 Pixmap		pixmask;
 Display		*display;
-Window		*Root;
+Window		Root;
 int			d_depth;
 GC			NormalGC;
 XpmIcon		wmgen;
--- a/wmgeneral/wmgeneral.h
+++ b/wmgeneral/wmgeneral.h
@@ -29,7 +29,7 @@
 /*******************/
 
 extern Display	*display;
-extern Window	*Root;
+extern Window	Root;
 extern int		d_depth;
 extern GC		NormalGC;
 extern XpmIcon	wmgen;
--- a/wmMand/wmMand.c
+++ b/wmMand/wmMand.c
@@ -124,8 +124,10 @@
 int maxIterations;
 LargeViewer largeViewProg = LARGEVIEWER_IM;
 
-int WriteGIF();
-
+typedef unsigned char byte;
+int WriteGIF(FILE *fp, byte *pic, int ptype, int w, int h, byte *rmap,
+                byte *gmap, byte *bmap, int numcols, int colorstyle,
+                char *comment);
 
 /*
  *	 main
--- a/wmMand/xvgifwr.c
+++ b/wmMand/xvgifwr.c
@@ -78,14 +78,9 @@
 
 
 /*************************************************************/
-int WriteGIF(fp, pic, ptype, w, h, rmap, gmap, bmap, numcols, colorstyle,
-	     comment)
-     FILE *fp;
-     byte *pic;
-     int   ptype, w,h;
-     byte *rmap, *gmap, *bmap;
-     int   numcols, colorstyle;
-     char *comment;
+int WriteGIF(FILE *fp, byte *pic, int ptype, int w, int h, byte *rmap,
+		byte *gmap, byte *bmap, int numcols, int colorstyle,
+		char *comment)
 {
   int   RWidth, RHeight;
   int   LeftOfs, TopOfs;
--- a/wmMand/wmMand.c
+++ b/wmMand/wmMand.c
@@ -392,6 +392,9 @@
 			printf("\t\E[1m-d, --delayzoom <number>\E[m\n\t\tset delay for autozooming with mouse (default %d, larger values give longer delay). Dependent on CPU cycle availability\n", autoZoomDelay);
 			printf("\t\E[1m-x, --xv\E[m\n\t\tuse xv to display large image instead of ImageMagic's display program\n");
 			printf("\t\E[1m-h, --help\E[m\n\t\tdisplay help screen\n");
+			if (!strcmp(argv[i], "--help") || !strcmp(argv[i] , "-h")) {
+				exit(0);
+			}
 			exit(1);
 		}
 	}