diff --git a/os2/Makefile.os2 b/os2/Makefile.os2
index 05ba15d..b135911 100644
--- a/os2/Makefile.os2
+++ b/os2/Makefile.os2
@@ -3,10 +3,15 @@
 # wmake -f Makefile.os2
 
 CC=wcc386
-INCLUDES=-I..\os2 -I..\src
 CPPFLAGS=-DHAVE_SIGNAL_H -DHAVE_SYS_TIME_H
 CPPFLAGS+= -DSOUND_OS2DART
+!ifndef __UNIX__
 CPPFLAGS+= -DVERSION="4.2.0"
+INCLUDES=-I..\os2 -I..\src
+!else
+CPPFLAGS+= -DVERSION=\"4.2.0\"
+INCLUDES=-I../os2 -I../src
+!endif
 # for an exe using libxmp.dll: link to libxmp.lib
 # for a statically linked exe: link to xmp_static.lib
 LIBS=libxmp.lib mmpm2.lib
@@ -29,9 +34,19 @@ all: $(AOUT)
 $(AOUT): $(OBJ)
 	wlink N $(AOUT) SYS OS2V2 LIBR {$(LIBS)} F {$(OBJ)}
 
-clean:
-	FOR %F IN ( $(AOUT) $(OBJ) $(EXTRA_OBJ) ) DO IF EXIST %F ERASE %F
-
-.c: ..\src
 .c.obj:
 	$(COMPILE) -fo=$^@ $<
+
+!ifndef __UNIX__
+.c: ..\src
+distclean: clean .symbolic
+	@if exist $(AOUT) del $(AOUT)
+clean: .symbolic
+	@if exist *.obj del *.obj
+!else
+.c: ../src
+distclean: clean .symbolic
+	rm -f $(AOUT)
+clean: .symbolic
+	rm -f *.obj
+!endif
diff --git a/os2/usleep.c b/os2/usleep.c
index f0e8a2b..0947c1e 100644
--- a/os2/usleep.c
+++ b/os2/usleep.c
@@ -2,5 +2,5 @@
 #include <os2.h>
 void usleep (unsigned long usec)
 {
-	DosSleep(usec ? (usec/1000l) : 1l);
+	DosSleep((usec >= 1000)? (usec / 1000) : 1);
 }
diff --git a/src/sound_dart.c b/src/sound_dart.c
index 6bb6e26..6deb703 100644
--- a/src/sound_dart.c
+++ b/src/sound_dart.c
@@ -76,7 +76,6 @@ static int init(struct options *options)
 	int flags;
 	int i;
 	MCI_AMP_OPEN_PARMS AmpOpenParms;
-	char *token;
 
 	parm_init(parm);
 	chkparm1("sharing", sharing = *token);