Use portable arguments so that `rpmrebuild` can build on systems that don't have GNU Coreutils installed.

rpmrebuild.mac-compat.patch

diff --git c/src/Makefile.include w/src/Makefile.include
index b6384ff..b75516c 100644
--- c/src/Makefile.include
+++ w/src/Makefile.include
@@ -1,11 +1,11 @@
-INSTALL_RUN := install --mode=555
-INSTALL_RO  := install --mode=444
-INSTALL_MAN := install --mode=644
-INSTALL_LOCALE := install --mode=644
-LN          := ln --symbolic --force --no-dereference
+INSTALL_RUN := install -m 555
+INSTALL_RO  := install -m 444
+INSTALL_MAN := install -m 644
+INSTALL_LOCALE := install -m 644
+LN          := ln -sfn
 MKDIR       := mkdir -p
-RM          := rm --force
-RMDIR       := rm --force --recursive
+RM          := rm -f
+RMDIR       := rm -rf
 
 TARGET_DIR    := $(DESTDIR)/usr/bin
 TARGET_LIB    := $(DESTDIR)/usr/lib/rpmrebuild
@@ -18,7 +18,7 @@ LANGS := en fr_FR fr_FR.UTF-8
 # add current version in man pages
 define MakeManPage
 	@$(RM) $@
-	@read VERSION < $(TOP_DIR)/Version && sed -e "s/@VERSION@/$$VERSION/g" < $<  > $@ || { $(RM) $@; exit 1; }
+	@read VERSION < $(TOP_DIR)/Version && LC_ALL=C sed -e "s/@VERSION@/$$VERSION/g" < $<  > $@ || { $(RM) $@; exit 1; }
 endef
 
 # install man pages
diff --git c/src/rpmrebuild_parser.src w/src/rpmrebuild_parser.src
index 5b25842..3407ea1 100644
--- c/src/rpmrebuild_parser.src
+++ w/src/rpmrebuild_parser.src
@@ -1091,7 +1091,7 @@ function ProcessLongOptions
 
 			version)
 				set -e
-					source $MY_LIB_DIR/VERSION
+					cat $MY_LIB_DIR/VERSION
 				set +e
 				echo "$VERSION"
 				NEED_EXIT=0

rpmrebuild.make-vars.patch

diff --git c/src/Makefile w/src/Makefile
index 86759ab..f70d241 100644
--- c/src/Makefile
+++ w/src/Makefile
@@ -18,7 +18,7 @@ RPM_DEFINES :=                             \
    --define '_srcrpmdir $(RPM_SRPMS_DIR)'  \
    --define '_rpmfilename %%{NAME}-%%{VERSION}-%%{RELEASE}.%%{ARCH}.rpm'
 
-VERSION=$(shell cat Version)
+VERSION=$(shell cat Version.master)
 TAR_FILE := $(RPM_SOURCE_DIR)/rpmrebuild-$(VERSION).tar.gz
 
 SCRIPTS     := rpmrebuild 
@@ -64,23 +64,22 @@ SOURCES :=               \
    $(SCRIPTS)            \
    $(LIB_SCRIPTS)        \
    $(INCLUDE_SCRIPTS)    \
-   $(SPEC_SCRIPTS)       \
-   $(MANPAGES_SRC)	 \
-   $(LOCALES)		 \
+   $(MANPAGES_SRC)       \
+   $(LOCALES)            \
    $(DOC_FILES)          \
    Makefile              \
    Makefile.include      \
    Changelog             \
    rpmrebuild.spc        \
    rpmrebuild.files      \
-   Version               \
+   Version.master        \
    Release               \
 
 TAR_NAMES_PLUGINS := $(shell $(MAKE) --quiet -C plugins tar_names)
 TAR_NAMES := $(SOURCES) rpmrebuild.spec $(TAR_NAMES_PLUGINS)
 
 define Spec
-   Version="`cat Version`"             && \
+   Version="`cat Version.master`"      && \
    Release="`cat Release`"             && \
    {                                      \
       echo "Version: $$Version"        && \
@@ -95,14 +94,14 @@ endef
 all: rpmrebuild.spec VERSION $(MANPAGES) 
 	$(MAKE) -C plugins $@
 
-rpmrebuild.spec: rpmrebuild.spc Version Release Changelog 
+rpmrebuild.spec: rpmrebuild.spc Version.master Release Changelog 
 	$(RM) $@
 	$(Spec) > $@ || { $(RM) $@; exit 1; }
 
-$(MANPAGES): %: %.in $(TOP_DIR)/Version
+$(MANPAGES): %: %.in $(TOP_DIR)/Version.master
 	$(MakeManPage)
 
-VERSION: Version
+VERSION: Version.master
 	$(RM) $@
 	read VERSION < $< && echo "VERSION='$$VERSION'" > $@ || { $(RM) $@; exit 1; }
 
@@ -129,7 +128,7 @@ rpmbuild:	tar
 	rpm --resign rpmrebuild*.rpm
 
 clean:
-	$(RMDIR) $(ROOT) $(RPM_BUILD_DIR)
+	$(RMDIR) $(RPM_BUILD_DIR)
 	$(RM)    VERSION rpmrebuild.spec *.rpm rpmrebuild.tar.gz rpmrebuild.tar.gz.sig
 	$(RM)    $(MANPAGES)
 	$(MAKE) -C plugins $@
diff --git c/src/Version w/src/Version.master
similarity index 100%
rename from src/Version
rename to src/Version.master