I want to install this gimp-normalmap plugin on my Ubuntu 18.04 system by downloading and unpacking the gimp-normalmap-1.2.3.tar.bz2 file and running the make command in the unpacked folder. Then I get his error message:

gcc -c -O3 -Wall `pkg-config --cflags gtk+-2.0 gtkglext-1.0 gimp-2.0` normalmap.c
Package gimp-2.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `gimp-2.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'gimp-2.0' found
normalmap.c:26:10: fatal error: gtk/gtk.h: No such file or directory
 #include <gtk/gtk.h>
compilation terminated.
Makefile.linux:26: recipe for target 'normalmap.o' failed
make: *** [normalmap.o] Error 1

The install instructions include:

The only required packages that must be installed to build the plugin
(besides Gtk+ and the GIMP) are:

  1) gimp version 2.4 or later
  2) pkg-config version 0.14 or later
  3) gtkglext version 0.7.1 or later
  4) GLEW version 1.3.3 or later

You will need to install the development packages for your distribution for
Gtk+, Glib, gtkglext, GLEW and GIMP.

I did install all of those and checked by searching for each package with dpkg-query -l *package* When entering dpkg-query -l *gtk+* nothing turns up (which is normal I guess) and dpkg-query -l *gtk* shows a long list of which I don't know what to do with.

GIMP is installed via the Software Center, not via apt-get because the latter one installs an outdated version.


I just installed libgimp2.0-dev by executing sudo apt-get install libgimp2.0-dev and now I get this new error message when executing make:

gcc -c -O3 -Wall `pkg-config --cflags gtk+-2.0 gtkglext-1.0 gimp-2.0` normalmap.c
gcc -c -O3 -Wall `pkg-config --cflags gtk+-2.0 gtkglext-1.0 gimp-2.0` preview3d.c
gcc -c -O3 -Wall `pkg-config --cflags gtk+-2.0 gtkglext-1.0 gimp-2.0` scale.c
gcc  normalmap.o preview3d.o scale.o `pkg-config --libs gtk+-2.0 gtkglext-1.0 gimp-2.0 gimpui-2.0` -L/usr/X11R6/lib -lGLEW -o normalmap
/usr/bin/ld: normalmap.o: undefined reference to symbol 'sqrtf@@GLIBC_2.2.5'
//lib/x86_64-linux-gnu/libm.so.6: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
Makefile.linux:17: recipe for target 'normalmap' failed
make: *** [normalmap] Error 1
  • How exactly did you install the packages listed? it looks like pkg-config can't find at least the libgtk2.0-dev and libgimp2.0-dev packages – steeldriver Aug 5 '19 at 12:50
  • Wait, how did you know that libgimp2.0-dev must be installed? I just checked and it wasn't. So I installed it, tried make again and now I get a different error message. I will update my post. – EVARATE Aug 5 '19 at 12:55
  • The new error appears to indicate an omission in the Makefile.linux - open it in a text editor and add -lm to the end of the LIBS (after -L/usr/X11R6/lib -lGLEW) – steeldriver Aug 5 '19 at 13:12
  • Awesome, that solved it. Thank you very much! – EVARATE Aug 5 '19 at 13:14
  • 1
    Instead of editing the title to "solved", you should add an answer. – SurvivalMachine Aug 5 '19 at 13:46


  • Install libgimp2.0-dev
  • Add -lm to the end of the LIBS after -L/usr/X11R6/lib -lGLEW

Thanks to @steeldriver for providing the solution.

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