diff --git a/CMakeLists.txt b/CMakeLists.txt
index c1f903efcf9bf0aa4a8ac61172e700bd8fcb4319..df12a45f4ab7e12c9d2abc7b7341a4fd6df373ca 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -37,9 +37,13 @@ ELSE()
   message("wordexp.h is not found" )
 ENDIF()
 
+### -------------- proj ---------------------------
+find_package(PROJ)
+if(PROJ4::proj)
+  list(APPEND cdo_compile_defintions ${HAVE_PROJ})
+endif()
 
 ### -------------- fftw3 ---------------------------
-
 message("Start check for fftw3")
 find_package(FFTW3 3.0 REQUIRED)
 if(NOT FFTW3_LIBRARIES)