Porqué me dá este error al instalar?

[ZeroZ]

Hola, estoy intentando instalar gpsim con el fink:
fink -y install gpsim
me dice que necesito gtk+extra, lo intento instalar y me dá el siguente error.

checking for gtk+-2.0 >= 1.3.13... Package gtk+-2.0 was not found in the pkg-config search path. Perhaps you should add the directory containing `gtk+-2.0.pc' to the PKG_CONFIG_PATH environment variable No package 'gtk+-2.0' found
configure: error: Library requirements (gtk+-2.0 >= 1.3.13) not met; consider adjusting the PKG_CONFIG_PATH environment variable if your libraries are in a nonstandard prefix so pkg-config can find them.
### execution of ./configure failed, exit code 1

No sé por que me da porque gtk+2.0 ya lo instalé y no me dió ningún problema.

Saludos