diff --git a/.gitignore b/.gitignore
index 457b1ed7..c2d28f12 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,8 +8,7 @@ initrd/sys/moon.sym
 initrd/bin/**
 apps/bin/**
 tests/**/bin/**
-base/usr/include/**
-base/usr/lib/**
+base/usr/**
 **/*.a
 ports/**/workdir/**
 ports/ports.list
diff --git a/ports/add-port.sh b/ports/add-port.sh
index 73b08103..222931ac 100755
--- a/ports/add-port.sh
+++ b/ports/add-port.sh
@@ -4,6 +4,8 @@ set -e
 
 cd $(dirname $0)/..
 
+unset LUNA_BASE
+
 source tools/env.sh
 
 cd ports
@@ -50,6 +52,24 @@ mkdir -p $workdir
 
 source $pkgscript
 
+if ! [ -z ${pkgdeps+x} ]
+then
+    echo "Installing dependencies of $pkgname..."
+    for pkg in ${pkgdeps[@]}
+    do
+        set +e
+        grep $pkg ports.list >/dev/null
+        if [ "$?" = "0" ]
+        then
+            echo "Dependency $pkg is already installed."
+        else
+            echo "Installing dependency $pkg..."
+            ./add-port.sh $pkg
+        fi
+        set -e
+    done
+fi
+
 echo "Building $pkgname version $pkgver..."
 
 cd $workdir
@@ -67,14 +87,18 @@ then
         *) echo "Don't know how to download package mode '$pkgmode'"; exit 1;;
     esac
 
+    set +e
     command -v port_unpack >/dev/null
+    set -e
     if [ "$?" = "0" ]
     then
         echo "Unpacking $pkgname version $pkgver..."
         port_unpack | filter-lines $pkgname "unpack"
     fi
 
+    set +e
     command -v port_patch >/dev/null
+    set -e
     if [ "$?" = "0" ]
     then
         echo "Patching $pkgname version $pkgver..."
@@ -87,7 +111,9 @@ cd $workdir
 mkdir -p $builddir
 cd $builddir
 
+set +e
 command -v port_configure >/dev/null
+set -e
 if [ "$?" = "0" ]
 then
     echo "Configuring $pkgname version $pkgver..."
diff --git a/ports/gmp/gmp.patch b/ports/gmp/gmp.patch
new file mode 100644
index 00000000..ab6934dd
--- /dev/null
+++ b/ports/gmp/gmp.patch
@@ -0,0 +1,11 @@
+diff --color -rN -u gmp-vanilla/invalid.c gmp-6.2.1/invalid.c
+--- a/gmp-6.2.1/invalid.c	2020-11-14 19:45:09.000000000 +0100
++++ b/gmp-6.2.1/invalid.c	2022-10-26 21:09:20.102237128 +0200
+@@ -77,6 +77,6 @@
+ void
+ __gmp_invalid_operation (void)
+ {
+-  raise (SIGFPE);
++//  raise (SIGFPE);
+   abort ();
+ }
diff --git a/ports/gmp/package.sh b/ports/gmp/package.sh
new file mode 100644
index 00000000..d8fde85b
--- /dev/null
+++ b/ports/gmp/package.sh
@@ -0,0 +1,44 @@
+pkgname="gmp"
+pkgver="6.2.1"
+pkgurl="https://ftp.gnu.org/gnu/gmp/gmp-$pkgver.tar.xz"
+
+pkgmode="web"
+
+islib=1
+
+setupdir="$workdir"
+builddir="$workdir/build"
+installdir="$workdir/build"
+srcdir="$workdir/gmp-$pkgver"
+
+port_unpack()
+{
+    tar xvf gmp-$pkgver.tar.xz
+}
+
+port_patch()
+{
+    patch -u -i $portdir/gmp.patch -p 1 -d $workdir
+}
+
+port_configure()
+{
+    CC_FOR_BUILD=gcc $srcdir/configure --enable-shared=no --with-gnu-ld --host=x86_64-luna --prefix=/usr
+}
+
+port_build()
+{
+    make -j$(nproc)
+}
+
+port_install()
+{
+    make DESTDIR=$LUNA_BASE install
+    rm -f $LUNA_BASE/usr/lib/*.la
+}
+
+port_uninstall()
+{
+    make DESTDIR=$LUNA_BASE uninstall
+    rm -f $LUNA_BASE/usr/lib/libgmp.a
+}
\ No newline at end of file
diff --git a/ports/mpc/package.sh b/ports/mpc/package.sh
new file mode 100644
index 00000000..d28aaa7d
--- /dev/null
+++ b/ports/mpc/package.sh
@@ -0,0 +1,41 @@
+pkgname="mpc"
+pkgver="1.2.1"
+pkgurl="https://ftp.gnu.org/gnu/mpc/mpc-$pkgver.tar.gz"
+
+pkgmode="web"
+
+pkgdeps=('gmp' 'mpfr')
+
+islib=1
+
+setupdir="$workdir"
+builddir="$workdir/build"
+installdir="$workdir/build"
+srcdir="$workdir/mpc-$pkgver"
+
+port_unpack()
+{
+    tar xvf mpc-$pkgver.tar.gz
+}
+
+port_configure()
+{
+    $srcdir/configure --host=x86_64-luna --with-gnu-ld --enable-shared=no --prefix=/usr
+}
+
+port_build()
+{
+    make -j$(nproc)
+}
+
+port_install()
+{
+    make DESTDIR=$LUNA_BASE install
+    rm -f $LUNA_BASE/usr/lib/*.la
+}
+
+port_uninstall()
+{
+    make DESTDIR=$LUNA_BASE uninstall
+    rm -f $LUNA_BASE/usr/lib/libmpc.a
+}
\ No newline at end of file
diff --git a/ports/mpfr/package.sh b/ports/mpfr/package.sh
new file mode 100644
index 00000000..b9df3d56
--- /dev/null
+++ b/ports/mpfr/package.sh
@@ -0,0 +1,41 @@
+pkgname="mpfr"
+pkgver="4.1.0"
+pkgurl="https://ftp.gnu.org/gnu/mpfr/mpfr-$pkgver.tar.gz"
+
+pkgmode="web"
+
+pkgdeps=('gmp')
+
+islib=1
+
+setupdir="$workdir"
+builddir="$workdir/build"
+installdir="$workdir/build"
+srcdir="$workdir/mpfr-$pkgver"
+
+port_unpack()
+{
+    tar xvf mpfr-$pkgver.tar.gz
+}
+
+port_configure()
+{
+    $srcdir/configure --with-gnu-ld --host=x86_64-luna --enable-shared=no --prefix=/usr
+}
+
+port_build()
+{
+    make -j$(nproc)
+}
+
+port_install()
+{
+    make DESTDIR=$LUNA_BASE install
+    rm -f $LUNA_BASE/usr/lib/*.la
+}
+
+port_uninstall()
+{
+    make DESTDIR=$LUNA_BASE uninstall
+    rm -f $LUNA_BASE/usr/lib/libmpfr.a
+}
\ No newline at end of file
diff --git a/tools/env.sh b/tools/env.sh
index ef286d38..4a9e8061 100755
--- a/tools/env.sh
+++ b/tools/env.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
-export LUNA_ROOT=$(realpath $(dirname $0)/..)
-export LUNA_BASE=$LUNA_ROOT/base
+export LUNA_ROOT=${LUNA_ROOT:-$(realpath $(dirname $0)/..)}
+export LUNA_BASE=${LUNA_BASE:-$LUNA_ROOT/base}
 export PATH=$LUNA_ROOT/toolchain/x86-64-luna/bin:$LUNA_ROOT/toolchain/dist:$PATH
 
 export CC=x86_64-luna-gcc
diff --git a/tools/install-built-ports.sh b/tools/install-built-ports.sh
index 919994eb..8e21fbc4 100755
--- a/tools/install-built-ports.sh
+++ b/tools/install-built-ports.sh
@@ -22,6 +22,7 @@ unset_vars()
     unset port_build
     unset port_install
     unset port_uninstall
+    unset islib
 }
 
 if ! [ -f ./ports.list ]
@@ -38,10 +39,13 @@ install_port()
     export portdir=$PWD/$1
     export workdir=$portdir/workdir
     source $portdir/package.sh
-    echo "installing port: $pkgname version $pkgver"
-    mkdir -p $installdir
-    cd $installdir
-    port_install | filter-lines $pkgname "install"
+    if ! [ "$islib" = "1" ]
+    then
+        echo "installing port: $pkgname version $pkgver"
+        mkdir -p $installdir
+        cd $installdir
+        port_install | filter-lines $pkgname "install"
+    fi
 }
 
 while read package; do