added m4 toolchain build

build.sh

@@ -47,6 +47,8 @@ LINUX_VERSION=6.18.7
 IFS='.' read -r LINUX_VERSION_MAJOR LINUX_VERSION_MINOR LINUX_VERSION_PATCH <<< $LINUX_VERSION
 LINUX_URL=https://cdn.kernel.org/pub/linux/kernel/v$LINUX_VERSION_MAJOR.x/linux-$LINUX_VERSION.tar.xz
 
+M4_VERSION=1.4.20
+M4_URL=https://mirror.ufs.ac.za/gnu/m4/m4-$M4_VERSION.tar.xz
 
 if [ ! -d "$SYSROOT" ]; then
     mkdir -p "$SYSROOT"/{etc,cross,sources,usr,dev,proc,sys,run}
@@ -196,8 +198,26 @@ bootstap_libstdcpp() {
     cd "$SOURCES" && rm -rf gcc-$GCC_VERSION
 }
 
+toolchain_m4() {
+	fetch $M4_URL
+
+	cd "$SOURCES" && tar xf m4-$M4_VERSION.tar.xz && cd m4-$M4_VERSION
+
+	sed -r '/_GL_EXTERN_C/s/w?memchr|bsearch/(&)/' -i $(find -name \*.in.h)
+
+	./configure \
+		--prefix=/usr \
+		--host=$TARGET \
+		--build=$(build-aux/config.guess)
+
+	make  && make DESTDIR="$SYSROOT" install
+
+	cd "$SOURCES" && rm -rf m4-$M4_VERSION
+}
+
 #bootstrap_binutils
 #bootstap_gcc
 #bootstap_linux
 #bootstap_glibc
-bootstap_libstdcpp
+#bootstap_libstdcpp
+toolchain_m4