diff --git a/sdk/common.mk b/sdk/common.mk
index 91ec216..0c9c987 100644
--- a/sdk/common.mk
+++ b/sdk/common.mk
@@ -29,7 +29,7 @@ ifeq ($(OS),Windows_NT)
   ZXSDK_PLATFORM = $(ZXSDK)/windows-x86
  endif
 else
- ZXSDK_PLATFORM	= $(ZXSDK)
+ ZXSDK_PLATFORM = $(ZXSDK)
 endif
 export ZXSDK_PLATFORM
 
@@ -80,7 +80,7 @@ ZCCCFG = $(Z88DK)/lib/config
 ifeq ($(OS),Windows_NT)
  # Fix paths under Cygwin for Z88DK on Windows
  ifeq ($(shell echo $$OSTYPE),cygwin)
-  ZCCCFG = $(shell cygpath -m $(ZCCCFG))
+  ZCCCFG := $(shell cygpath -m $(ZCCCFG))
  endif
 endif
 export ZCCCFG
diff --git a/sdk/src/sdcc.inc.mk b/sdk/src/sdcc.inc.mk
index 1733973..b9d52f6 100644
--- a/sdk/src/sdcc.inc.mk
+++ b/sdk/src/sdcc.inc.mk
@@ -99,10 +99,10 @@ install-sdcc: | sdcc/.extracted
 	for d in $(SDCC_SUBDIRS); do\
 		if [ $$d = bin ]; then\
 			find $$d -type f\
-			| awk '{print gensub(/^(.+)\/([^/]+)/, "$$(DEST)$$(prefix)/\\1/\\2: \\1/\\2 | $$(DEST)$$(prefix)/\\1\n\t$$(INSTALL_PROGRAM) -m 755 $$< $$@", "g")}';\
+			| sed -Ee 's,^(.+)/([^/]+),$$(DEST)$$(prefix)/\1/\2: \1/\2 | $$(DEST)$$(prefix)/\1\n\t$$(INSTALL_PROGRAM) -m 755 $$< $$@,';\
 		else\
 			find $$d -type f\
-			| awk '{print gensub(/^(.+)\/([^/]+)/, "$$(DEST)$$(prefix)/\\1/\\2: \\1/\\2 | $$(DEST)$$(prefix)/\\1\n\t$$(INSTALL) -m 644 $$< $$@", "g")}';\
+			| sed -Ee 's,^(.+)/([^/]+),$$(DEST)$$(prefix)/\1/\2: \1/\2 | $$(DEST)$$(prefix)/\1\n\t$$(INSTALL) -m 644 $$< $$@,';\
 		fi;\
 	done; } >install.mk;\
 	$(MAKE) -w -f install.mk DEST=$(DEST) prefix=$(prefix) INSTALL=$(INSTALL) INSTALL_PROGRAM=$(INSTALL_PROGRAM) install