diff --git a/pkg/tc-cloog/build b/pkg/tc-cloog/build
deleted file mode 100755
index 8928ba9..0000000
--- a/pkg/tc-cloog/build
+++ /dev/null
@@ -1,25 +0,0 @@
-VERSION="0.18.1"
-SRCDIR="cloog-$VERSION"
-TARBALL="cloog-$VERSION.tar.gz"
-URL="ftp://gcc.gnu.org/pub/gcc/infrastructure"
-SHA256SUM="02500a4edd14875f94fe84cbeda4290425cb0c1c2474c6f75d75a303d64b4196"
-DEPENDS="tc-pkgtool"
-
-prepare() {
-	return
-}
-
-build() {
-	return
-}
-
-deploy() {
-	touch "$PKGDEPLOYDIR/$PKGNAME.files"
-	touch "$PKGDEPLOYDIR/$PKGNAME.desc"
-}
-
-check_update() {
-	curl --silent --list-only "$URL/" | grep -o "cloog-[0-9.]*tar.gz" | \
-	    sed 's/cloog-//g' | sed 's/.tar.gz//g' | \
-	    verson_find_greatest "$VERSION"
-}
\ No newline at end of file
diff --git a/pkg/tc-gcc1/build b/pkg/tc-gcc1/build
index 6b2dde4..d39a92b 100755
--- a/pkg/tc-gcc1/build
+++ b/pkg/tc-gcc1/build
@@ -3,7 +3,7 @@ SRCDIR="gcc-$VERSION"
 TARBALL="gcc-$VERSION.tar.xz"
 URL="http://ftp.gnu.org/gnu/gcc/gcc-$VERSION"
 SHA256SUM="64baadfe6cc0f4947a84cb12d7f0dfaf45bb58b7e92461639596c21e02d97d2c"
-DEPENDS="tc-binutils tc-cloog tc-gmp tc-isl tc-mpc tc-mpfr linux-dev fortify-headers"
+DEPENDS="tc-binutils linux-dev fortify-headers"
 
 prepare() {
 	apply_patches
@@ -20,20 +20,7 @@ prepare() {
 		    -i "$PKGSRCDIR/$SRCDIR/gcc/config/$subdir"
 	done
 
-	for child in cloog gmp isl mpc mpfr; do
-		include_pkg "tc-$child"
-
-		if [ ! -e "$child" ]; then
-			echo "installing symlink to $child..."
-			ln -s "$PKGSRCDIR/$SRCDIR" "$child"
-		else
-			if [ ! -L "$child" ]; then
-				echo "ERROR: $child " \
-					"exists but is not a symlink!"
-				exit 1
-			fi
-		fi
-	done
+	./contrib/download_prerequisites --verify --sha512
 }
 
 build() {
diff --git a/pkg/tc-gmp/build b/pkg/tc-gmp/build
deleted file mode 100755
index f70b68a..0000000
--- a/pkg/tc-gmp/build
+++ /dev/null
@@ -1,17 +0,0 @@
-# inherit package details from target GMP package
-source "$SCRIPTDIR/pkg/gmp/build"
-DEPENDS="tc-pkgtool"
-SUBPKG="tc-gmp"
-
-prepare() {
-	return
-}
-
-build() {
-	return
-}
-
-deploy() {
-	touch "$PKGDEPLOYDIR/$PKGNAME.files"
-	touch "$PKGDEPLOYDIR/$PKGNAME.desc"
-}
\ No newline at end of file
diff --git a/pkg/tc-isl/build b/pkg/tc-isl/build
deleted file mode 100755
index 7ca9e0e..0000000
--- a/pkg/tc-isl/build
+++ /dev/null
@@ -1,25 +0,0 @@
-VERSION="0.18"
-SRCDIR="isl-$VERSION"
-TARBALL="isl-$VERSION.tar.bz2"
-URL="ftp://gcc.gnu.org/pub/gcc/infrastructure"
-SHA256SUM="6b8b0fd7f81d0a957beb3679c81bbb34ccc7568d5682844d8924424a0dadcb1b"
-DEPENDS="tc-pkgtool"
-
-prepare() {
-	return
-}
-
-build() {
-	return
-}
-
-deploy() {
-	touch "$PKGDEPLOYDIR/$PKGNAME.files"
-	touch "$PKGDEPLOYDIR/$PKGNAME.desc"
-}
-
-check_update() {
-	curl --silent --list-only "$URL/" | grep -o "isl-[0-9.]*tar.bz2" | \
-	    sed 's/isl-//g' | sed 's/.tar.bz2//g' | \
-	    verson_find_greatest "$VERSION"
-}
\ No newline at end of file
diff --git a/pkg/tc-mpc/build b/pkg/tc-mpc/build
deleted file mode 100755
index 1deb925..0000000
--- a/pkg/tc-mpc/build
+++ /dev/null
@@ -1,23 +0,0 @@
-VERSION="1.1.0"
-SRCDIR="mpc-$VERSION"
-TARBALL="mpc-$VERSION.tar.gz"
-URL="http://ftp.gnu.org/gnu/mpc"
-SHA256SUM="6985c538143c1208dcb1ac42cedad6ff52e267b47e5f970183a3e75125b43c2e"
-DEPENDS="tc-pkgtool"
-
-prepare() {
-	return
-}
-
-build() {
-	return
-}
-
-deploy() {
-	touch "$PKGDEPLOYDIR/$PKGNAME.files"
-	touch "$PKGDEPLOYDIR/$PKGNAME.desc"
-}
-
-check_update() {
-	check_update_simple "$URL" "mpc-" "tar.gz"
-}
\ No newline at end of file
diff --git a/pkg/tc-mpfr/build b/pkg/tc-mpfr/build
deleted file mode 100755
index 2f53584..0000000
--- a/pkg/tc-mpfr/build
+++ /dev/null
@@ -1,23 +0,0 @@
-VERSION="4.0.2"
-SRCDIR="mpfr-$VERSION"
-TARBALL="mpfr-$VERSION.tar.xz"
-URL="http://ftp.gnu.org/gnu/mpfr"
-SHA256SUM="1d3be708604eae0e42d578ba93b390c2a145f17743a744d8f3f8c2ad5855a38a"
-DEPENDS="tc-pkgtool"
-
-prepare() {
-	return
-}
-
-build() {
-	return
-}
-
-deploy() {
-	touch "$PKGDEPLOYDIR/$PKGNAME.files"
-	touch "$PKGDEPLOYDIR/$PKGNAME.desc"
-}
-
-check_update() {
-	check_update_simple "$URL" "mpfr-" "tar.xz"
-}
\ No newline at end of file