diff --git a/makefile_linux b/makefile_linux
index 64a2c25c..46ff5bbd 100644
--- a/makefile_linux
+++ b/makefile_linux
@@ -10,10 +10,16 @@
 #NIOBJ= nigpib.o
 #NILIB=-lgpibenet
 
-include linux_def
+# The variable SRC is needed for the case, where source and objects are
+# separated. In the case where objects are mixed up with sources, SRC
+# is assumed to be empty and does not harm. I case of problems
+# please ask Markus Zolliker.
+
+include $(SRC)linux_def
 
 CC       = gcc
-CFLAGS = -I$(HDFROOT)/include -DHDF4 -DHDF5 $(NI) -Ipsi/hardsup -I. \
+CFLAGS = -I$(HDFROOT)/include -DHDF4 -DHDF5 $(NI) \
+       -I$(SRC)psi/hardsup -I$(SRC). \
        -fwritable-strings -DCYGNUS -DNONINTF -g $(DFORTIFY)
 
 BINTARGET = bin