I have GNUStep installed on my GNU/Linux, but got this error message: # make gcc -c -D_BSD_SOURCE -Demacs -DHAVE_CONFIG_H -I. -I/home/sun/sandbox/emacs- 23.0.0_NS-9.0pre1/src -D_BSD_SOURCE -g -O2 nsterm.m nsterm.m: In function `ns_init_paths': nsterm.m:292: error: cannot find interface declaration for `NXConstantString' nsterm.m:292: error: cannot find interface declaration for `NXConstantString' nsterm.m:298: error: cannot find interface declaration for `NXConstantString' nsterm.m:301: error: cannot find interface declaration for `NXConstantString' nsterm.m:311: error: cannot find interface declaration for `NXConstantString' nsterm.m:311: error: cannot find interface declaration for `NXConstantString' nsterm.m:311: error: cannot find interface declaration for `NXConstantString' nsterm.m:313: error: cannot find interface declaration for `NXConstantString' nsterm.m:332: error: cannot find interface declaration for `NXConstantString' nsterm.m:332: error: cannot find interface declaration for `NXConstantString' nsterm.m:334: error: cannot find interface declaration for `NXConstantString' nsterm.m:349: error: cannot find interface declaration for `NXConstantString' nsterm.m:364: error: cannot find interface declaration for `NXConstantString' nsterm.m: In function `ns_update_end': nsterm.m:616: warning: `NSView' may not respond to `-unlockFocusNeedsFlush:' nsterm.m:616: warning: (Messages without a matching method signature nsterm.m:616: warning: will be assumed to return `id' and accept nsterm.m:616: warning: `...' as arguments.) nsterm.m: In function `ns_get_color': nsterm.m:1129: error: cannot find interface declaration for `NXConstantString' nsterm.m:1246: error: cannot find interface declaration for `NXConstantString' nsterm.m:1248: error: cannot find interface declaration for `NXConstantString' nsterm.m:1250: error: cannot find interface declaration for `NXConstantString' nsterm.m:1252: error: cannot find interface declaration for `NXConstantString' nsterm.m:1254: error: cannot find interface declaration for `NXConstantString' nsterm.m:1272: error: cannot find interface declaration for `NXConstantString' nsterm.m: In function `ns_term_init': nsterm.m:3046: error: cannot find interface declaration for `NXConstantString' nsterm.m:3048: error: cannot find interface declaration for `NXConstantString' nsterm.m:3051: error: cannot find interface declaration for `NXConstantString' nsterm.m:3058: error: cannot find interface declaration for `NXConstantString' nsterm.m:3082: error: cannot find interface declaration for `NXConstantString' nsterm.m: In function `-[EmacsView menuDown:]': nsterm.m:4200: warning: multiple methods named `-representedObject' found /usr/GNUstep/System/Library/Headers/AppKit/NSCell.h:351: warning: using `-(id)representedObject' /usr/GNUstep/System/Library/Headers/AppKit/NSRulerMarker.h:76: warning: also found `-(id )representedObject' nsterm.m:4202: warning: multiple methods named `-representedObject' found /usr/GNUstep/System/Library/Headers/AppKit/NSCell.h:351: warning: using `-(id)representedObject' /usr/GNUstep/System/Library/Headers/AppKit/NSRulerMarker.h:76: warning: also found `-(id )representedObject' nsterm.m: In function `-[EmacsPrefsController init]': nsterm.m:4781: error: cannot find interface declaration for `NXConstantString' nsterm.m: In function `ns_dumpglyphs': nsterm.m:5001: warning: comparison between pointer and integer nsterm.m:5087: warning: comparison between pointer and integer nsterm.m:5093: warning: comparison between pointer and integer nsterm.m: In function `removeSynthItal': nsterm.m:5340: error: cannot find interface declaration for `NXConstantString' nsterm.m: In function `ns_load_font': nsterm.m:5372: warning: assignment discards qualifiers from pointer target type nsterm.m:5423: warning: assignment discards qualifiers from pointer target type nsterm.m:5448: error: cannot find interface declaration for `NXConstantString' nsterm.m:5582: error: cannot find interface declaration for `NXConstantString' nsterm.m:5583: error: cannot find interface declaration for `NXConstantString' nsterm.m: In function `ns_list_fonts': nsterm.m:5679: warning: assignment discards qualifiers from pointer target type nsterm.m:5688: warning: assignment makes pointer from integer without a cast nsterm.m:5699: error: cannot find interface declaration for `NXConstantString' nsterm.m:5702: warning: assignment discards qualifiers from pointer target type nsterm.m:5717: warning: assignment discards qualifiers from pointer target type nsterm.m:5724: error: cannot find interface declaration for `NXConstantString' nsterm.m:5725: warning: assignment discards qualifiers from pointer target type nsterm.m:5732: warning: assignment discards qualifiers from pointer target type nsterm.m: In function `ns_font_to_xlfd': nsterm.m:5794: warning: initialization discards qualifiers from pointer target type nsterm.m:5800: error: cannot find interface declaration for `NXConstantString' nsterm.m:5813: error: cannot find interface declaration for `NXConstantString' nsterm.m: In function `ns_fontname_to_xlfd': nsterm.m:5847: error: cannot find interface declaration for `NXConstantString' make: *** [nsterm.o] Error 1 I add "#include " to the head of nsterm.m, but got same error messages. This is what configure outputs: What operating system and machine description files should Emacs use? `s/gnu-linux.h' and `m/intel386.h' What compiler should emacs be built with? gcc -g -O2 Should Emacs use the GNU version of malloc? yes (Using Doug Lea's new malloc from the GNU C Library.) Should Emacs use a relocating allocator for buffers? yes Should Emacs use mmap(2) for buffer allocation? no What window system should Emacs use? nextstep What toolkit should Emacs use? none Where do we find X Windows header files? NONE Where do we find X Windows libraries? NONE Does Emacs use -lXaw3d? no Does Emacs use -lXpm? no Does Emacs use -ljpeg? no Does Emacs use -ltiff? no Does Emacs use -lungif? no Does Emacs use -lpng? no Does Emacs use X toolkit scroll bars? yes