diff --git a/apps/CMakeLists.txt b/apps/CMakeLists.txt
index 2dabb0e..b0f624c 100644
--- a/apps/CMakeLists.txt
+++ b/apps/CMakeLists.txt
@@ -22,19 +22,21 @@
 SET(APPS_DIR ${CMAKE_SOURCE_DIR}/apps)
 
 SET(GRCC_COMMAND ${PC_GNURADIO_RUNTIME_PREFIX}/${GR_RUNTIME_DIR}/grcc)
+SET(BLOCK_PATH ../grc/)
 
 ADD_CUSTOM_TARGET(airprobe_file.py ALL)
 ADD_CUSTOM_COMMAND(
  TARGET airprobe_file.py
- COMMAND ${GRCC_COMMAND} -d ${CMAKE_CURRENT_BINARY_DIR} 
+ COMMAND GRC_BLOCKS_PATH=${BLOCK_PATH} ${GRCC_COMMAND} -d ${CMAKE_CURRENT_BINARY_DIR} 
  ARGS "airprobe_file.grc"
+# COMMAND ${GRCC_COMMAND} -d ${CMAKE_CURRENT_BINARY_DIR} 
  WORKING_DIRECTORY ${APPS_DIR}
 )
 
 ADD_CUSTOM_TARGET(airprobe_rtlsdr.py ALL)
 ADD_CUSTOM_COMMAND(
  TARGET airprobe_rtlsdr.py
- COMMAND ${GRCC_COMMAND} -d ${CMAKE_CURRENT_BINARY_DIR} 
+ COMMAND GRC_BLOCKS_PATH=${BLOCK_PATH} ${GRCC_COMMAND} -d ${CMAKE_CURRENT_BINARY_DIR} 
  ARGS "airprobe_rtlsdr.grc"
  WORKING_DIRECTORY ${APPS_DIR}
 )