Dear list trying to compile Nagios3 on Fedora Core 4 I got the following error: ... gcc -g -O2 -DHAVE_CONFIG_H -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -DNSCGI -o statusmap.cgi statusmap.c getcgi.o cgiutils.o cgiauth.o objects-cgi.o xobjects-cgi.o statusdata-cgi.o xstatusdata-cgi.o comments-cgi.o downtime-cgi.o -lgd -lttf -lpng -ljpeg -lz -lm -lglib-2.0 gcc -g -O2 -DHAVE_CONFIG_H -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -DNSCGI -o trends.cgi trends.c getcgi.o cgiutils.o cgiauth.o objects-cgi.o xobjects-cgi.o statusdata-cgi.o xstatusdata-cgi.o comments-cgi.o downtime-cgi.o -lgd -lttf -lpng -ljpeg -lz -lm -lglib-2.0 gcc -g -O2 -DHAVE_CONFIG_H -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -DNSCGI -o histogram.cgi histogram.c getcgi.o cgiutils.o cgiauth.o objects-cgi.o xobjects-cgi.o statusdata-cgi.o xstatusdata-cgi.o comments-cgi.o downtime-cgi.o -lgd -lttf -lpng -ljpeg -lz -lm -lglib-2.0 make[1]: Leaving directory `/usr/src/nagios/nagios-cvs/cgi' cd ./html && make make[1]: Entering directory `/usr/src/nagios/nagios-cvs/html' make[1]: Nothing to be done for `all'. make[1]: Leaving directory `/usr/src/nagios/nagios-cvs/html' cd ./module && make make[1]: Entering directory `/usr/src/nagios/nagios-cvs/module' gcc -g -O2 -DHAVE_CONFIG_H -fPIC -o helloworld.o helloworld.c -shared In file included from ../include/nebcallbacks.h:28, from helloworld.c:27: ../include/config.h:195:18: error: glib.h: No such file or directory make[1]: *** [helloworld.o] Error 1 make[1]: Leaving directory `/usr/src/nagios/nagios-cvs/module' make: *** [all] Error 2 Andurin from german nagios forum suggested to change a line in the Makefile in folder module to: CFLAGS=-g -O2 -DHAVE_CONFIG_H -fPIC -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include This solved the problem. Only the Makefile in the folder module was affected. Thomas