diff --git a/include/date.h b/include/date.h
new file mode 100644
index 00000000..4ff28a29
--- /dev/null
+++ b/include/date.h
@@ -0,0 +1 @@
+#define DATE "@(#) Yale compilation date:Mon May 25 21:15:08 EDT 1992"
diff --git a/include/yalecad/base.h b/include/yalecad/base.h
index dc5775d0..60a4bdff 100644
--- a/include/yalecad/base.h
+++ b/include/yalecad/base.h
@@ -161,7 +161,7 @@ typedef long SHORT_LONG ;
 
 #endif /* ultrix, linux */
 
-#if defined(THINK_C) || defined(linux)
+#if defined(THINK_C) || defined(linux) || __APPLE__
 #define PROTOTYPES_OK
 #endif /* Mac, linux */
 
diff --git a/src/Ylib/CMakeLists.txt b/src/Ylib/CMakeLists.txt
index 5118f736..2e7d7472 100644
--- a/src/Ylib/CMakeLists.txt
+++ b/src/Ylib/CMakeLists.txt
@@ -3,7 +3,7 @@
 #add_executable(mincut main.c output.c readcells.c ${CMAKE_SOURCE_DIR}/src/date/date.c)
 
 
-add_library(ycadgraywolf SHARED assign.c buster.c cleanup.c colors.c deck.c dialog.c draw.c dset.c edcolors.c file.c getftime.c graph.c grid.c hash.c heap.c list.c log.c menus.c message.c mst.c mytime.c okmalloc.c path.c plot.c program.c project.c queue.c quicksort.c radixsort.c rand.c rbtree.c relpath.c set.c stat.c stats.c string.c system.c time.c timer.c trans.c wgraphics.c ydebug.c yreadpar.c )
+add_library(ycadgraywolf SHARED assign.c buster.c cleanup.c colors.c deck.c dialog.c draw.c dset.c edcolors.c file.c getftime.c graph.c grid.c hash.c heap.c list.c log.c menus.c message.c mst.c mytime.c okmalloc.c path.c plot.c program.c project.c queue.c quicksort.c radixsort.c rand.c rbtree.c relpath.c set.c stat.c stats.c string.c system.c time.c timer.c trans.c wgraphics.c ydebug.c yreadpar.c  ${CMAKE_SOURCE_DIR}/src/date/date.c)
 
 target_link_libraries(ycadgraywolf ${X11_LIBRARIES})
 target_link_libraries(ycadgraywolf m)
diff --git a/src/Ylib/relpath.c b/src/Ylib/relpath.c
index 826629d4..d1b78430 100644
--- a/src/Ylib/relpath.c
+++ b/src/Ylib/relpath.c
@@ -58,7 +58,7 @@ char *known_path, *rel_path ; /* known path and relative path to it */
     char known_fpath[LRECL] ; /* full path of known obj */
     char *ptr ;               /* used to replace obj with relative path */
     char *result ;            /* resulting path */
-    char *Yfixpath(), *strrchr(), *strcat() ;
+    char *Yfixpath()/*, *strrchr(), *strcat()*/ ;
     INT  up ;              /* keeps count of backtracking up dir tree */
 
     /* make a copy of path */