diff --git a/bin/makefile-tail b/bin/makefile-tail
index 2cd5511..d7f16c6 100755
--- a/bin/makefile-tail
+++ b/bin/makefile-tail
@@ -188,7 +188,7 @@ EXTFILES = $(OBJECTDIR)usrsubr.o
 default	: $(OSARCHDIR)lde $(OSARCHDIR)$(LDENAME) $(OSARCHDIR)ldeether \
 	$(OSARCHDIR)tstsout $(OSARCHDIR)setsout $(OSARCHDIR)keymaker
 
-$(OSARCHDIR)lde: $(SRCDIR)ldeboot.c $(SRCDIR)unixfork.c
+$(OSARCHDIR)lde: $(SRCDIR)ldeboot.c $(SRCDIR)unixfork.c $(INCDIR)unixfork.h
 	$(CC) $(CFLAGS) -I$(INCDIR) $(SRCDIR)ldeboot.c $(SRCDIR)unixfork.c \
 		$(LDELDFLAGS) -o $(OSARCHDIR)lde
 
@@ -235,7 +235,7 @@ $(OBJECTDIR)main.o : $(SRCDIR)main.c  $(REQUIRED-INCS) $(INCDIR)lispemul.h \
 	 $(INCDIR)emlglob.h  $(INCDIR)address.h $(INCDIR)lsptypes.h \
 	 $(INCDIR)adr68k.h  $(INCDIR)stack.h  $(INCDIR)lspglob.h \
 	 $(INCDIR)lispmap.h  $(INCDIR)ifpage.h  $(INCDIR)iopage.h \
-	 $(INCDIR)return.h $(INCDIR)debug.h $(INCDIR)profile.h
+	 $(INCDIR)return.h $(INCDIR)debug.h $(INCDIR)profile.h $(INCDIR)unixfork.h
 	$(CC) $(RFLAGS) $(SRCDIR)main.c $(INLINE) -o $(OBJECTDIR)main$(OEXT)
 
 $(OBJECTDIR)dbgtool.o :  $(SRCDIR)dbgtool.c  $(REQUIRED-INCS) $(INCDIR)lispemul.h  \
@@ -1034,7 +1034,7 @@ release : $(INSDIR)$(LDENAME).o userfiles $(INSDIR)$(LDENAME) \
 
 userfiles : $(INSDIR)usrsubr.c $(INSDIR)makefile $(INSDIR)ldeether.c
 
-$(INSDIR)lde: $(SRCDIR)ldeboot.c $(SRCDIR)unixfork.c
+$(INSDIR)lde: $(SRCDIR)ldeboot.c $(SRCDIR)unixfork.c $(INCDIR)unixfork.h
 	$(CC) $(CFLAGS) -I$(INCDIR) $(SRCDIR)ldeboot.c $(SRCDIR)unixfork.c \
 		$(LDELDFLAGS) -o $(INSDIR)lde
 
diff --git a/inc/unixfork.h b/inc/unixfork.h
new file mode 100644
index 0000000..becd330
--- /dev/null
+++ b/inc/unixfork.h
@@ -0,0 +1,7 @@
+int fork_Unix();
+#ifdef FULLSLAVENAME
+int ForkUnixShell(int slot, char *PtySlave, char *termtype, char *shellarg);
+#else
+int ForkUnixShell(int slot, char ltr, char numb, char *termtype, char *shellarg);
+#endif
+
diff --git a/src/ldeboot.c b/src/ldeboot.c
index 50ce7fb..dbb25eb 100644
--- a/src/ldeboot.c
+++ b/src/ldeboot.c
@@ -40,6 +40,8 @@ static char *id = "$Id: ldeboot.c,v 1.3 1999/01/03 02:07:13 sybalsky Exp $ Copyr
 #include <stdlib.h>
 #include <unistd.h>
 
+#include "unixfork.h"
+
 #ifdef XWINDOW
 #ifndef SYSVONLY
 #include <strings.h>
@@ -49,7 +51,6 @@ static char *id = "$Id: ldeboot.c,v 1.3 1999/01/03 02:07:13 sybalsky Exp $ Copyr
 #include <X11/Xutil.h>
 #include "XVersion.h"
 #define LDEX "ldex"
-extern char *getenv();
 #endif /* XWINDOW */
 
 #define LDEMONO "ldesingle"
diff --git a/src/main.c b/src/main.c
index 5a0b757..f3662bc 100644
--- a/src/main.c
+++ b/src/main.c
@@ -22,6 +22,8 @@ static char *id = "$Id: main.c,v 1.4 2001/12/26 22:17:03 sybalsky Exp $ Copyrigh
 
 #include "lispemul.h"
 #include "dbprint.h"
+#include "unixfork.h"
+
 #include <sys/types.h>
 #ifndef DOS
 #include <sys/param.h>
diff --git a/src/unixfork.c b/src/unixfork.c
index 35b168f..568af59 100644
--- a/src/unixfork.c
+++ b/src/unixfork.c
@@ -92,6 +92,8 @@ typedef int clockid_t;
 #include <sgtty.h>
 #endif
 
+#include "unixfork.h"
+
 /* The following globals are used to communicate between Unix
    subprocesses and LISP */
 
@@ -127,9 +129,9 @@ loop:
 /* Creates a PTY connection to a csh */
 
 #ifdef FULLSLAVENAME
-ForkUnixShell(int slot, char *PtySlave, char *termtype, char *shellarg)
+int ForkUnixShell(int slot, char *PtySlave, char *termtype, char *shellarg)
 #else
-ForkUnixShell(int slot, char ltr, char numb, char *termtype, char *shellarg)
+int ForkUnixShell(int slot, char ltr, char numb, char *termtype, char *shellarg)
 #endif
 {
 #ifdef FULLSLAVENAME