added m4 toolchain step

build/m4/build.bash

@@ -0,0 +1,49 @@
+
+. "$PROJECTDIR/build/m4/package.env"
+
+fetch $M4_URL
+
+cd "$SOURCES" && tar xf m4-$M4_VERSION.tar.xz && cd m4-$M4_VERSION
+
+
+bootstrap() {
+    echo bootstrap
+}
+
+
+toolchain() {
+	sed -r '/_GL_EXTERN_C/s/w?memchr|bsearch/(&)/' -i $(find -name \*.in.h)
+
+	./configure \
+		--prefix=/usr \
+		--host=$TARGET \
+		--build=$(build-aux/config.guess) > /dev/null
+
+	make > /dev/null  && make DESTDIR="$SYSROOT" install > /dev/null
+}
+
+setup() {
+	echo setup
+}
+
+final() {
+	echo final
+}
+
+case $1 in 
+    bootstrap)
+		bootstrap
+		;;
+	toolchain)
+		toolchain
+		;;
+	setup)
+		setup
+		;;
+	final)
+		final
+		;;
+esac
+
+
+cd "$SOURCES" && rm -rf "$SOURCES/m4-$M4_VERSION"

build/m4/package.env

@@ -0,0 +1,7 @@
+export M4_VERSION=1.4.20
+
+IFS='.' read -r M4_VERSION_MAJOR M4_VERSION_MINOR <<< $M4_VERSION
+export M4_VERSION_MAJOR M4_VERSION_MINOR
+
+export M4_URL=https://mirror.ufs.ac.za/gnu/m4/m4-$M4_VERSION.tar.xz
+