Index: build
==================================================================
--- build
+++ build
@@ -16,10 +16,68 @@
 if [ -z "${pkg}" ]; then
 	echo "Usage: build [--cpio] <package>" 2>&1
 
 	exit 1
 fi
+
+function verifyRequiredPackages() {
+	local pkg pkgdomain pkgversion
+	local pkgdir pkgconfigdir pkgfound
+
+	for pkg in "${require[@]}"; do
+		pkgdomain=''
+		pkgversion=''
+
+		case "${pkg}" in
+			*/*@*)
+				pkgdomain="$(echo "${pkg}" | cut -f 2 -d '@')"
+				pkgversion="$(echo "${pkg}" | cut -f 2 -d '/' | cut -f 1 -d '@')"
+				pkg="$(echo "${pkg}" | cut -f 1 -d '/')"
+				;;
+			*/*)
+				pkgversion="$(echo "${pkg}" | cut -f 2 -d '/')"
+				pkg="$(echo "${pkg}" | cut -f 1 -d '/')"
+				;;
+			*@*)
+				pkgdomain="$(echo "${pkg}" | cut -f 2 -d '@')"
+				pkg="$(echo "${pkg}" | cut -f 1 -d '@')"
+				;;
+		esac
+
+		if [ -z "${pkgdomain}" ]; then
+			pkgdomain="${domain}"
+		fi
+
+		pkgfound='0'
+		for pkgdir in "/opt/appfs/${pkgdomain}/${pkg}/platform"/${pkgversion:-*}; do
+			pkgconfigdir="${pkgdir}/lib/pkgconfig"
+
+			if [ -d "${pkgdir}" ]; then
+				pkgfound='1'
+			fi
+
+			CFLAGS="${CFLAGS} -I${pkgdir}/include"
+			CPPFLAGS="${CPPFLAGS} -I${pkgdir}/include"
+			LDFLAGS="${LDFLAGS} -L${pkgdir}/lib"
+			export CFLAGS CPPFLAGS LDFLAGS
+
+			if [ -d "${pkgconfigdir}" ]; then
+				PKG_CONFIG_PATH="${PKG_CONFIG_PATH}:${pkgconfigdir}"
+				export PKG_CONFIG_PATH
+			fi
+
+		done
+
+		if [ "${pkgfound}" = '0' ]; then
+			die "Package ${pkg}/${pkgversion:-*}@${pkgdomain} not found."
+		fi
+	done
+}
+
+function verifyPrerequisites() {
+	:
+}
 
 function determineOsArch() {
 	os="$(uname -s | dd conv=lcase 2>/dev/null)"
 	arch="$(uname -m | dd conv=lcase 2>/dev/null)"
 
@@ -55,14 +113,15 @@
 
 	if [ ! -d "${glibcdir}" ]; then
 		die 'glibc directory is not available (appfs running/working?)'
 	fi
 
-	CFLAGS="-I${glibcdir}/include"
-	CPPFLAGS="-I${glibcdir}/include"
-	LDFLAGS="-Wl,--rpath,${glibcdir}/lib -Wl,--dynamic-linker,${dynlinker}"
-	export CFLAGS CPPFLAGS LDFLAGS
+	CFLAGS="${CFLAGS} -I${glibcdir}/include"
+	CPPFLAGS="${CPPFLAGS} -I${glibcdir}/include"
+	LDFLAGS="${LDFLAGS} -Wl,--rpath,${glibcdir}/lib -Wl,--dynamic-linker,${dynlinker}"
+	PKG_CONFIG_LIBDIR="${glibcdir}/lib/pkgconfig"
+	export CFLAGS CPPFLAGS LDFLAGS PKG_CONFIG_LIBDIR
 
 	./configure --prefix="${prefix}" --sysconfdir=/etc --localstatedir=/var
 }
 
 function prebuild() {
@@ -212,10 +271,14 @@
 dir="$(echo *)"
 if [ -e "${dir}" ]; then
 	mv "${dir}"/* .
 fi
 
+# Verify pre-requisites are met
+verifyRequiredPackages || die 'Required packages missing'
+verifyPrerequisites || die 'Prerequisities failed'
+
 # Start logging
 set -x
 
 # Determine properties
 determinePrefix

Index: pkgs/binutils
==================================================================
--- pkgs/binutils
+++ pkgs/binutils
@@ -2,5 +2,6 @@
 
 version=2.24
 url="http://ftp.gnu.org/gnu/binutils/binutils-2.24.tar.gz"
 domain=core.appfs.rkeene.org
 sha256='4930b2886309112c00a279483eaef2f0f8e1b1b62010e0239c16b22af7c346d4'
+require=(zlib)