xbps-src: check for required utilities in the host system.

README

@@ -75,7 +75,7 @@ and its helpers:
 To build binary packages with xbps-src also the following software needs
 to be installed into the host system:
 
- - awk, bash, bison, gcc c++, gettext, path, texinfo, perl and fakeroot.
+ - awk, bash, gcc c++, gettext, patch, texinfo, perl and fakeroot.
  - xbps static utilities, available from http://launchpad.net/xbps.
 
 Additionally if you want to work as 'root':

xbps-src/xbps-src.sh.in

@@ -46,6 +46,21 @@ sighandler_exit()
 	exit $?
 }
 
+check_reqhost_utils()
+{
+	[ -n "$in_chroot" ] && return 0
+
+	echo -n "=> Checking for required host utilities... "
+	for f in awk bash sed gcc msgfmt patch makeinfo perl fakeroot; do
+		if ! command -v ${f} 2>&1 >/dev/null; then
+			echo
+			echo "${f} is missing in your system, can't continue! exiting..."
+			exit 1
+		fi
+	done
+	echo "done."
+}
+
 usage()
 {
 	cat << _EOF
@@ -178,6 +193,11 @@ if [ -z "$target" ]; then
 	usage && exit 1
 fi
 
+#
+# Check for required utilities in host system.
+#
+check_reqhost_utils
+
 #
 # Check configuration vars before anyting else, and set defaults vars.
 #