diff --git a/Makefile b/Makefile
index 82d317b..9185f68 100644
--- a/Makefile
+++ b/Makefile
@@ -1,32 +1,19 @@
-BASE_DIR=$(CURDIR)
-
-# Source and destination directories
-export ARCHIVES_DIR=$(BASE_DIR)/archive
-export BUILD_DIR=$(BASE_DIR)/compile
-export PACKAGES_DIR=$(BASE_DIR)/packages
-
-# Installation location
-export PREFIX=/opt/cross-mint
-
-# Add search path for cross tools
-export PATH:=$(PATH):/opt/cross-mint/bin
+include VARS
 
 # Default cross compiler
-export CC=$(shell which m68k-atari-mint-gcc)
+#export CC=$(shell which m68k-atari-mint-gcc)
 ARCH1=x86_64
 ARCH2=i386
 
 ##########################################
-export VERSIONBIN=bin-$(shell uname -s  | tr "[:upper:]" "[:lower:]")
-export VERSIONBINCPU=$(VERSIONBIN)-$(shell uname -m  | tr "[:upper:]" "[:lower:]")
-export VERSIONBUILD=$(shell date +%Y%m%d)
-
-##########################################
-all:	init_dirs binutils mintbin gcc gemlib qed distrib
+all:	init_dirs binutils mintbin gcc gemlib distrib
 
 init_dirs: $(BUILD_DIR) $(PACKAGES_DIR) $(ARCHIVES_DIR) $(PREFIX)
 
 clean:
+ifeq "$(BUILD_DIR)" ""
+	@echo "BUILD_DIR is not set" && exit 1
+endif
 	rm -rf "$(BUILD_DIR)"
 
 gcc:	$(BUILD_DIR)/gcclibs gcc464
diff --git a/Makefile.binutils b/Makefile.binutils
index 088f355..a0628f2 100644
--- a/Makefile.binutils
+++ b/Makefile.binutils
@@ -1,3 +1,5 @@
+include VARS
+
 PACKAGE_NAME=binutils
 VERSION=2.30
 VERSIONPATCH=-mint-20180703
@@ -11,8 +13,7 @@ PACKAGE_FILE=$(PACKAGE_NAME)-$(VERSION)$(VERSIONPATCH)-$(VERSIONBINCPU)-$(VERSIO
 BINARY_DIR=$(COMPIL_DIR)/binary-package
 LOCAL_PREFIX_DIR=$(BINARY_DIR)$(PREFIX)
 
-ARCH=x86_64
-CFLAGS="-Wno-error=deprecated-declarations -Wno-error=null-pointer-arithmetic"
+CFLAGS=-Wno-error=deprecated-declarations -Wno-error=null-pointer-arithmetic
 
 ##########################################
 .PHONY: all clean extract patch configure compile packaging install
@@ -20,6 +21,9 @@ CFLAGS="-Wno-error=deprecated-declarations -Wno-error=null-pointer-arithmetic"
 all:		extract patch configure compile packaging install
 
 clean:	
+ifeq "$(BUILD_DIR)" ""
+	@echo "BUILD_DIR is not set" && exit 1
+endif
 	rm -rf "$(COMPIL_DIR)"
 	rm -rf "$(SOURCE_DIR)"
 	rm -rf "$(PACKAGES_DIR)/$(PACKAGE_FILE)"
@@ -32,7 +36,7 @@ patch:		$(SOURCE_DIR)/_patch_$(PACKAGE_NAME)
 configure:	$(COMPIL_DIR)/Makefile
 
 compile:
-	make CFLAGS=$(CFLAGS) --directory="$(COMPIL_DIR)"
+	make CFLAGS="$(CFLAGS)" --directory="$(COMPIL_DIR)"
 
 packaging:	$(PACKAGES_DIR)/$(PACKAGE_FILE)
 
diff --git a/Makefile.cflib b/Makefile.cflib
index 99b09d9..586634c 100644
--- a/Makefile.cflib
+++ b/Makefile.cflib
@@ -1,3 +1,5 @@
+include VARS
+
 PACKAGE_NAME=cflib
 VERSION=Git-$(VERSIONBUILD)
 VERSIONPATCH=Git-mint-macos
@@ -17,6 +19,9 @@ LOCAL_PREFIX_DIR=$(BINARY_DIR)$(PREFIX)
 all:		extract patch configure compile packaging install
 
 clean:	
+ifeq "$(BUILD_DIR)" ""
+	@echo "BUILD_DIR is not set" && exit 1
+endif
 	rm -rf "$(COMPIL_DIR)"
 	rm -rf "$(SOURCE_DIR)"
 	rm -rf "$(PACKAGES_DIR)/$(PACKAGE_FILE)"
diff --git a/Makefile.gcc464 b/Makefile.gcc464
index a903ee4..775271f 100644
--- a/Makefile.gcc464
+++ b/Makefile.gcc464
@@ -1,6 +1,8 @@
+include VARS
+
 PACKAGE_NAME=gcc
 VERSION=4.6.4
-VERSIONPATCH=-mint-macos
+VERSIONPATCH=-mint-macos-20200504
 SOURCE_DIR=$(BUILD_DIR)/$(PACKAGE_NAME)-$(VERSION)
 COMPIL_DIR=$(BUILD_DIR)/$(PACKAGE_NAME)-$(VERSION)$(VERSIONPATCH)-$(VERSIONBINCPU)
 GIT_SRC=
@@ -11,7 +13,6 @@ PACKAGE_FILE=$(PACKAGE_NAME)-$(VERSION)$(VERSIONPATCH)-$(VERSIONBINCPU)-$(VERSIO
 BINARY_DIR=$(COMPIL_DIR)/binary-package
 LOCAL_PREFIX_DIR=$(BINARY_DIR)$(PREFIX)
 
-ARCH=x86_64
 CFLAGS=
 
 ##########################################
@@ -20,6 +21,9 @@ CFLAGS=
 all:		extract patch configure compile packaging install
 
 clean:	
+ifeq "$(BUILD_DIR)" ""
+	@echo "BUILD_DIR is not set" && exit 1
+endif
 	rm -rf "$(COMPIL_DIR)"
 	rm -rf "$(SOURCE_DIR)"
 	rm -rf "$(PACKAGES_DIR)/$(PACKAGE_FILE)"
diff --git a/Makefile.gcclibs b/Makefile.gcclibs
index d59adab..e346748 100644
--- a/Makefile.gcclibs
+++ b/Makefile.gcclibs
@@ -1,14 +1,14 @@
+include VARS
+
 PACKAGE_NAME=gcclibs
-GMP=gmp-6.2.0
-MPFR=mpfr-4.0.2
-MPC=mpc-1.1.0
+GMP=gmp-6.2.1
+MPFR=mpfr-4.1.0
+MPC=mpc-1.2.1
 SOURCE_DIR=$(BUILD_DIR)
 COMPIL_DIR=$(BUILD_DIR)
 BINARY_DIR=$(COMPIL_DIR)/gcclibs
 LOCAL_PREFIX_DIR=$(BINARY_DIR)
 
-ARCH=x86_64
-
 ##########################################
 .PHONY: all gmp mpfr mpc
 
diff --git a/Makefile.gemlib b/Makefile.gemlib
index 0c7f39a..960be14 100644
--- a/Makefile.gemlib
+++ b/Makefile.gemlib
@@ -1,3 +1,5 @@
+include VARS
+
 PACKAGE_NAME=gemlib
 VERSION=Git-$(VERSIONBUILD)
 VERSIONPATCH=
@@ -17,6 +19,9 @@ LOCAL_PREFIX_DIR=$(BINARY_DIR)$(PREFIX)
 all:		extract patch configure compile packaging install
 
 clean:	
+ifeq "$(BUILD_DIR)" ""
+	@echo "BUILD_DIR is not set" && exit 1
+endif
 	rm -rf "$(COMPIL_DIR)"
 	rm -rf "$(SOURCE_DIR)"
 	rm -rf "$(PACKAGES_DIR)/$(PACKAGE_FILE)"
diff --git a/Makefile.gemma b/Makefile.gemma
index f7567a3..8e7a26b 100644
--- a/Makefile.gemma
+++ b/Makefile.gemma
@@ -1,3 +1,5 @@
+include VARS
+
 PACKAGE_NAME=gemma
 VERSION=Git-$(VERSIONBUILD)
 VERSIONPATCH=
@@ -17,6 +19,9 @@ LOCAL_PREFIX_DIR=$(BINARY_DIR)$(PREFIX)
 all:		extract patch configure compile packaging install
 
 clean:	
+ifeq "$(BUILD_DIR)" ""
+	@echo "BUILD_DIR is not set" && exit 1
+endif
 	rm -rf "$(COMPIL_DIR)"
 	rm -rf "$(SOURCE_DIR)"
 	rm -rf "$(PACKAGES_DIR)/$(PACKAGE_FILE)"
diff --git a/Makefile.mintbin b/Makefile.mintbin
index 3752088..3b7f05b 100644
--- a/Makefile.mintbin
+++ b/Makefile.mintbin
@@ -1,3 +1,5 @@
+include VARS
+
 PACKAGE_NAME=mintbin
 VERSION=CVS-20110527
 VERSIONPATCH=
@@ -11,8 +13,7 @@ PACKAGE_FILE=$(PACKAGE_NAME)-$(VERSION)$(VERSIONPATCH)-$(VERSIONBINCPU)-$(VERSIO
 BINARY_DIR=$(COMPIL_DIR)/binary-package
 LOCAL_PREFIX_DIR=$(BINARY_DIR)$(PREFIX)
 
-ARCH=x86_64
-CFLAGS=-D_POSIX_SOURCE
+CFLAGS=-D_POSIX_SOURCE -Wno-implicit-function-declaration
 
 ##########################################
 .PHONY: all clean extract patch configure compile packaging install
@@ -20,11 +21,13 @@ CFLAGS=-D_POSIX_SOURCE
 all:		extract patch configure compile packaging install
 
 clean:	
+ifeq "$(BUILD_DIR)" ""
+	@echo "BUILD_DIR is not set" && exit 1
+endif
 	rm -rf "$(COMPIL_DIR)"
 	rm -rf "$(SOURCE_DIR)"
 	rm -rf "$(PACKAGES_DIR)/$(PACKAGE_FILE)"
 
-
 ##########################################
 extract:	$(SOURCE_DIR)
 
@@ -33,7 +36,7 @@ patch:		$(SOURCE_DIR)/_patch_$(PACKAGE_NAME)
 configure:	$(COMPIL_DIR)/Makefile
 
 compile:
-	make --directory="$(COMPIL_DIR)" CFLAGS=$(CFLAGS)
+	make --directory="$(COMPIL_DIR)" CFLAGS="$(CFLAGS)"
 
 packaging:	$(PACKAGES_DIR)/$(PACKAGE_FILE)
 
@@ -51,7 +54,7 @@ ifneq "$(GIT_SRC)" ""
 	mkdir -p "$(dir $(SOURCE_DIR))"
 	cd "$(dir $(SOURCE_DIR))"  && git clone $(GIT_SRC)
 endif
-	cp /usr/local/share/automake-1.*/config.* "$(SOURCE_DIR)"
+	cp $(HOMEBREW_PREFIX)/share/automake-1.*/config.* "$(SOURCE_DIR)"
 
 
 # apply patch to sources
@@ -71,7 +74,7 @@ $(COMPIL_DIR)/Makefile:
 
 # build distribution package
 $(PACKAGES_DIR)/$(PACKAGE_FILE): $(COMPIL_DIR)/Makefile
-	make   --directory="$(COMPIL_DIR)" install DESTDIR="$(BINARY_DIR)" CFLAGS=$(CFLAGS)
+	make   --directory="$(COMPIL_DIR)" install DESTDIR="$(BINARY_DIR)" CFLAGS="$(CFLAGS)"
 	rm     "$(BINARY_DIR)/"m68k-atari-mint-*
 	rm -rf "$(LOCAL_PREFIX_DIR)/info"
 	mkdir  "$(LOCAL_PREFIX_DIR)/bin"
diff --git a/Makefile.mintlib b/Makefile.mintlib
index ad95610..99f64a0 100644
--- a/Makefile.mintlib
+++ b/Makefile.mintlib
@@ -1,5 +1,7 @@
+include VARS
+
 PACKAGE_NAME=mintlib
-VERSION=Git-20170304
+VERSION=Git-20200504
 VERSIONPATCH=-macos
 SOURCE_DIR=$(BUILD_DIR)/$(PACKAGE_NAME)-$(VERSION)
 COMPIL_DIR=$(BUILD_DIR)/$(PACKAGE_NAME)-$(VERSION)$(VERSIONPATCH)-$(VERSIONBIN)
@@ -27,6 +29,9 @@ endif
 all:		extract patch configure compile packaging install
 
 clean:	
+ifeq "$(BUILD_DIR)" ""
+	@echo "BUILD_DIR is not set" && exit 1
+endif
 	rm -rf "$(COMPIL_DIR)"
 	rm -rf "$(SOURCE_DIR)"
 	rm -rf "$(PACKAGES_DIR)/$(PACKAGE_FILE)"
diff --git a/Makefile.pml b/Makefile.pml
index 19c1985..1947271 100644
--- a/Makefile.pml
+++ b/Makefile.pml
@@ -1,6 +1,8 @@
+include VARS
+
 PACKAGE_NAME=pml
 VERSION=2.03
-VERSIONPATCH=-mint-20110207
+VERSIONPATCH=-mint-20191013
 SOURCE_DIR=$(BUILD_DIR)/$(PACKAGE_NAME)-$(VERSION)
 COMPIL_DIR=$(BUILD_DIR)/$(PACKAGE_NAME)-$(VERSION)$(VERSIONPATCH)-$(VERSIONBIN)
 GIT_SRC=
@@ -28,6 +30,9 @@ endif
 all:		extract patch configure compile packaging install
 
 clean:	
+ifeq "$(BUILD_DIR)" ""
+	@echo "BUILD_DIR is not set" && exit 1
+endif
 	rm -rf "$(COMPIL_DIR)"
 	rm -rf "$(SOURCE_DIR)"
 	rm -rf "$(PACKAGES_DIR)/$(PACKAGE_FILE)"
diff --git a/Makefile.qed b/Makefile.qed
index 2b0877d..360c816 100644
--- a/Makefile.qed
+++ b/Makefile.qed
@@ -1,3 +1,5 @@
+include VARS
+
 PACKAGE_NAME=qed
 VERSION=Git-$(VERSIONBUILD)
 VERSIONPATCH=-mint-macos
@@ -17,6 +19,9 @@ LOCAL_PREFIX_DIR=$(BINARY_DIR)
 all:		extract patch configure compile packaging install
 
 clean:	
+ifeq "$(BUILD_DIR)" ""
+	@echo "BUILD_DIR is not set" && exit 1
+endif
 	rm -rf "$(COMPIL_DIR)"
 	rm -rf "$(SOURCE_DIR)"
 	rm -rf "$(PACKAGES_DIR)/$(PACKAGE_FILE)"
diff --git a/VARS b/VARS
new file mode 100644
index 0000000..0829e77
--- /dev/null
+++ b/VARS
@@ -0,0 +1,28 @@
+.EXPORT_ALL_VARIABLES:
+
+BASE_DIR=$(CURDIR)
+
+# Source and destination directories
+ARCHIVES_DIR=$(BASE_DIR)/archive
+BUILD_DIR=$(BASE_DIR)/compile
+PACKAGES_DIR=$(BASE_DIR)/packages
+
+# Installation location
+PREFIX=/opt/cross-mint
+
+# Add search path for cross tools
+PATH:=$(PATH):/opt/cross-mint/bin
+
+# Default host architecture and system
+HOSTSYS=$(shell uname -s | tr "[:upper:]" "[:lower:]")
+ARCH=x86_64
+#ARCH=$(shell uname -m | tr "[:upper:]" "[:lower:]")
+
+# Homebrew installation location
+HOMEBREW_PREFIX=$(shell brew config | grep HOMEBREW_PREFIX | awk '{print $$2}')
+
+##########################################
+VERSIONBIN=bin-$(HOSTSYS)
+VERSIONBINCPU=$(VERSIONBIN)-$(ARCH)
+VERSIONBUILD=$(shell date +%Y%m%d)
+
diff --git a/archive/gcc-4.6.4-mint-macos-20200504.patch.bz2 b/archive/gcc-4.6.4-mint-macos-20200504.patch.bz2
new file mode 100644
index 0000000..32319da
Binary files /dev/null and b/archive/gcc-4.6.4-mint-macos-20200504.patch.bz2 differ
diff --git a/archive/gcc-4.6.4-mint-macos.patch.bz2 b/archive/gcc-4.6.4-mint-macos.patch.bz2
deleted file mode 100644
index fcc629d..0000000
Binary files a/archive/gcc-4.6.4-mint-macos.patch.bz2 and /dev/null differ
diff --git a/archive/mintlib-Git-20170304-macos.patch.bz2 b/archive/mintlib-Git-20200504-macos.patch.bz2
similarity index 100%
rename from archive/mintlib-Git-20170304-macos.patch.bz2
rename to archive/mintlib-Git-20200504-macos.patch.bz2