diff --git a/Pmodules/modbuild b/Pmodules/modbuild
index ef25b48..260c372 100755
--- a/Pmodules/modbuild
+++ b/Pmodules/modbuild
@@ -267,16 +267,8 @@ fi
 [[ -n ${BUILD_BLOCK} ]] || std::die 1 "No build-block specified!"
 [[ -r ${BUILD_BLOCK} ]] || std::die 1 "${BUILD_BLOCK}: no such file!"
 
-# :FIXME: move to library?
-# :FIXME: implement this with OS/system dependend plugins 
-
 declare -r OS
-case ${OS} in
-Darwin )
-	declare -x MACOSX_DEPLOYMENT_TARGET='10.9'
-	#declare -rx SDKROOT='macosx10.9'
-	;;
-esac
+
 
 # source Pmodule environment configuration
 if [[ "${bootstrap}" == "yes" ]]; then
@@ -285,10 +277,16 @@ if [[ "${bootstrap}" == "yes" ]]; then
         source "${BUILD_BLOCK_DIR}/../config/${pmodule_environment}"
 	declare -r BUILD_BASEDIR=$(std::get_abspath "${BUILD_BLOCK_DIR}/..")
 	
+	if [[ -r "${BUILD_BLOCK_DIR}/../config/modbuild.conf" ]]; then
+		source "${BUILD_BLOCK_DIR}/../config/modbuild.conf"
+	fi
 elif [[ -n ${PMODULES_ROOT} ]] && [[ -n ${PMODULES_CONFIG_DIR} ]] && \
      [[ -r ${PMODULES_ROOT}/${PMODULES_CONFIG_DIR}/${pmodule_environment} ]]; then
 	source ${PMODULES_ROOT}/${PMODULES_CONFIG_DIR}/${pmodule_environment}
 	declare -r BUILD_BASEDIR=$(std::get_abspath "${BUILD_BLOCK_DIR}/../..")
+	if [[ -r "${PMODULES_ROOT}/config/modbuild.conf" ]]; then
+		source "${PMODULES_ROOT}/config/modbuild.conf"
+	fi
 
 else
 	std::die 3 "Build environment not setup properbly!"
diff --git a/config/modbuild.conf b/config/modbuild.conf
new file mode 100644
index 0000000..7a25d05
--- /dev/null
+++ b/config/modbuild.conf
@@ -0,0 +1,9 @@
+#!/bin/bash
+
+case ${OS} in
+Darwin )
+	declare -x MACOSX_DEPLOYMENT_TARGET='10.12'
+	#declare -rx SDKROOT='macosx10.9'
+	;;
+esac
+
diff --git a/install_pmodules.sh b/install_pmodules.sh
index 33d4d7d..665117d 100755
--- a/install_pmodules.sh
+++ b/install_pmodules.sh
@@ -106,6 +106,10 @@ if [[ ! -e "${PMODULES_ROOT}/${PMODULES_CONFIG_DIR}/profile.bash" ]]; then
 	install -m 0755 "${SRC_DIR}/profile.bash"	"${PMODULES_ROOT}/${PMODULES_CONFIG_DIR}/profile.bash"
 fi
 
+if [[ ! -e "${PMODULES_ROOT}/${PMODULES_CONFIG_DIR}/modbuild.conf" ]]; then
+	install -m 0755 "${BOOTSTRAP_DIR}/config/modbuild.conf"	"${PMODULES_ROOT}/${PMODULES_CONFIG_DIR}/modbuild.conf"
+fi
+
 mkdir -p "${PMODULES_ROOT}/Tools/modulefiles"
 mkdir -p "${PMODULES_ROOT}/Libraries/modulefiles"