diff --git a/cmake_macros/esrocos.cmake b/cmake_macros/esrocos.cmake
index 3c7e923..bfd427a 100644
--- a/cmake_macros/esrocos.cmake
+++ b/cmake_macros/esrocos.cmake
@@ -159,6 +159,9 @@ function(esrocos_asn1_types_package NAME)
     # Process optional arguments
     set(MODE "ASN1")
     set(ASN1_OUT_DIR "${CMAKE_CURRENT_BINARY_DIR}/${NAME}")
+    file(MAKE_DIRECTORY ${ASN1_OUT_DIR})
+    set(ASN1_COMPILER "$ENV{HOME}/tool-inst/share/asn1scc/asn1.exe" CACHE STRING "ASN compiler location")
+    set(ASN1_PREFIX "asn1Scc" CACHE STRING "ASN type prefix")
     foreach(ARG ${ARGN})
         if(ARG STREQUAL "ASN1")
             # Set next argument mode to ASN1 file
@@ -180,6 +183,7 @@ function(esrocos_asn1_types_package NAME)
             elseif(MODE STREQUAL "OUTDIR")
                 # Add imported package
                 set(ASN1_OUT_DIR "${ARG}")
+                file(MAKE_DIRECTORY "${PROJECT_BINARY_DIR}/${ARG}")
             else()
                 # Unexpected mode
                 message(FATAL_ERROR "Internal error at esrocos_asn1_types_package(${NAME}): wrong mode ${MODE}.")
@@ -204,7 +208,7 @@ function(esrocos_asn1_types_package NAME)
     if(NOT EXISTS ${NAME}_timestamp)
         execute_process(
             COMMAND ${CMAKE_COMMAND} -E make_directory ${ASN1_OUT_DIR}
-            COMMAND mono $ENV{HOME}/tool-inst/share/asn1scc/asn1.exe -c -typePrefix asn1Scc -uPER -wordSize 8 -ACN -o ${ASN1_OUT_DIR} -atc ${ASN1_FILES}
+            COMMAND mono ${ASN1_COMPILER} -c -typePrefix ${ASN1_PREFIX} -uPER -wordSize 8 -ACN -o ${ASN1_OUT_DIR} -atc ${ASN1_FILES}
             RESULT_VARIABLE ASN1SCC_RESULT
         )
 
@@ -222,7 +226,7 @@ function(esrocos_asn1_types_package NAME)
     # Command for C compilation; creates timestamp file
     add_custom_command(OUTPUT ${NAME}_timestamp
         COMMAND ${CMAKE_COMMAND} -E make_directory ${ASN1_OUT_DIR}
-        COMMAND mono $ENV{HOME}/tool-inst/share/asn1scc/asn1.exe -c -typePrefix asn1Scc -uPER -wordSize 8 -ACN -o ${ASN1_OUT_DIR} -atc ${ASN1_FILES}
+        COMMAND mono ${ASN1_COMPILER} -c -typePrefix ${ASN1_PREFIX} -uPER -wordSize 8 -ACN -o ${ASN1_OUT_DIR} -atc ${ASN1_FILES}
         COMMAND ${CMAKE_COMMAND} -E touch ${NAME}_timestamp
         DEPENDS ${ASN1_FILES}
         COMMENT "Generate header files for: ${ASN1_IMPORTS} ${ASN1_FILES} in ${ASN1_OUT_DIR}"