diff -c ProjectCenter-0.6.2/GNUmakefile.preamble ProjectCenter-0.6.2.patched/GNUmakefile.preamble
--- ProjectCenter-0.6.2/GNUmakefile.preamble	2010-08-08 03:56:04.000000000 +0600
+++ artyom/ProjectCenter-0.6.2.patched/GNUmakefile.preamble	2014-12-01 20:08:31.000000000 +0600
@@ -39,7 +39,7 @@
 ADDITIONAL_INCLUDE_DIRS += -I./ -I./Headers
 
 # Additional LDFLAGS to pass to the linker
-ADDITIONAL_LDFLAGS += 
+ADDITIONAL_LDFLAGS += -lgnustep-base -lgnustep-gui
 
 # Additional library directories the linker should search
 ADDITIONAL_LIB_DIRS += -L./Framework/ProjectCenter.framework/$(GNUSTEP_TARGET_LDIR)

Diff finished.  Mon Dec  1 20:08:50 2014