diff --git a/tools/cfspack/cfspack.c b/tools/cfspack/cfspack.c
index 9e9094f..f222c79 100644
--- a/tools/cfspack/cfspack.c
+++ b/tools/cfspack/cfspack.c
@@ -1,8 +1,8 @@
-#define _GNU_SOURCE
 #include <stdio.h>
 #include <dirent.h>
 #include <string.h>
 #include <fnmatch.h>
+#include <libgen.h>
 #include <sys/stat.h>
 
 #define BLKSIZE 0x100
@@ -106,7 +106,7 @@ int spitdir(char *path, char *prefix, char *pattern)
             }
         } else {
             if (pattern) {
-                if (fnmatch(pattern, ep->d_name, FNM_EXTMATCH) != 0) {
+                if (fnmatch(pattern, ep->d_name, 0) != 0) {
                     continue;
                 }
             }
diff --git a/tools/emul/Makefile b/tools/emul/Makefile
index 372a809..f758068 100644
--- a/tools/emul/Makefile
+++ b/tools/emul/Makefile
@@ -26,11 +26,11 @@ $(TARGETS):
 	$(CC) $< libz80/libz80.o -o $@
 
 libz80/libz80.o: libz80/z80.c
-	make -C libz80/codegen opcodes
+	$(MAKE) -C libz80/codegen opcodes
 	$(CC) -Wall -ansi -g -c -o libz80/libz80.o libz80/z80.c
 
 $(CFSPACK):
-	make -C ../cfspack
+	$(MAKE) -C ../cfspack
 
 $(SHELLAPPS): $(ZASMBIN)
 	$(ZASMSH) $(KERNEL) $(APPS) shell/user.h < $(APPS)/$(notdir $@)/glue.asm > $@
diff --git a/tools/emul/shell/shell.c b/tools/emul/shell/shell.c
index 5fac826..97d8714 100644
--- a/tools/emul/shell/shell.c
+++ b/tools/emul/shell/shell.c
@@ -52,11 +52,11 @@ static uint8_t io_read(int unused, uint16_t addr)
 {
     addr &= 0xff;
     if (addr == STDIO_PORT) {
-        uint8_t c = getchar();
+        int c = getchar();
         if (c == EOF) {
             running = 0;
         }
-        return c;
+        return (uint8_t)c;
     } else if (addr == FS_DATA_PORT) {
         if (fsdev_addr_lvl != 0) {
             fprintf(stderr, "Reading FSDEV in the middle of an addr op (%d)\n", fsdev_ptr);
diff --git a/tools/zasm.sh b/tools/zasm.sh
index 584ea2c0..574f91b 100755
--- a/tools/zasm.sh
+++ b/tools/zasm.sh
@@ -1,13 +1,14 @@
-#!/bin/bash
+#!/bin/sh
 
 # wrapper around ./emul/zasm/zasm that prepares includes CFS prior to call
-DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+DIR=$(dirname $(readlink -f "$0"))
 ZASMBIN="${DIR}/emul/zasm/zasm"
 CFSPACK="${DIR}/cfspack/cfspack"
 INCCFS=$(mktemp)
 
 for p in "$@"; do
-    "${CFSPACK}" "${p}" "*.+(asm|h)" >> "${INCCFS}"    
+    "${CFSPACK}" "${p}" "*.h" >> "${INCCFS}"    
+    "${CFSPACK}" "${p}" "*.asm" >> "${INCCFS}"    
 done
 
 "${ZASMBIN}" "${INCCFS}"