--- CMakeLists.txt	2013-12-27 17:24:33.553596153 +0700
+++ CMakeLists.txt-no-hdf4-and-hdf5-simultaneously	2013-12-27 17:25:13.937026671 +0700
@@ -215,7 +215,7 @@ endif(enable-gsl)
 #	set(MGL_HAVE_LTDL 0)
 #endif(enable-all OR enable-ltdl)
 
-if(enable-hdf4)
+if(enable-hdf4 AND (NOT enable-hdf5))
 	set(MGL_HAVE_HDF4 1)
 	find_library(HDF4_LIB df)
 	find_library(HDF4MF_LIB mfhdf)
@@ -226,9 +226,9 @@ if(enable-hdf4)
 		message(SEND_ERROR "${HDF4_INCLUDE_DIR}")
 		message(SEND_ERROR "Couldn't find HDF4 libraries.")
 	endif(NOT HDF4_LIB OR NOT HDF4MF_LIB OR NOT HDF4_INCLUDE_DIR)
-else(enable-hdf4)
+else(enable-hdf4 AND (NOT enable-hdf5))
 	set(MGL_HAVE_HDF4 0)
-endif(enable-hdf4)
+endif(enable-hdf4 AND (NOT enable-hdf5))
 
 if(enable-hdf5)
 	set(MGL_HAVE_HDF5 1)