diff --git a/artsc/CMakeLists.txt b/artsc/CMakeLists.txt
index 5c8cbe6..51c5144 100644
--- a/artsc/CMakeLists.txt
+++ b/artsc/CMakeLists.txt
@@ -16,8 +16,8 @@ add_definitions( -DCOMPILING_ARTSC )
 
 set( prefix ${CMAKE_INSTALL_PREFIX} )
 set( exec_prefix $prefix )
-set( libdir $prefix/${LIB_INSTALL_DIR} )
-set( includedir ${prefix}/${INCLUDE_INSTALL_DIR} )
+set( libdir ${LIB_INSTALL_DIR} )
+set( includedir ${INCLUDE_INSTALL_DIR} )
 set( LIBDL -l${DL_LIBRARIES} )
 set( USE_THREADS )
 set( LIBPTHREAD ${CMAKE_THREAD_LIBS_INIT} )
diff --git a/artsc/artsc-config.in b/artsc/artsc-config.in
index 8b9b578..583fd1d 100755
--- a/artsc/artsc-config.in
+++ b/artsc/artsc-config.in
@@ -18,7 +18,7 @@ EOH
 prefix=@prefix@
 exec_prefix=@exec_prefix@
 libdir=@libdir@
-includedir=@includedir@
+includedir=@includedir@c
 libdl=@LIBDL@
 
 flags=""