checking size of long... 4 checking for char *... yes checking size of char *... 4 checking for dlopen in -ldl... (cached) yes checking for shl_unload in -ldld... no checking for size_t... yes checking size of size_t... 4 checking for unsigned long... yes checking size of unsigned long... 4 checking sizeof size_t == sizeof unsigned long... yes checking for PIE support... yes checking if enabling -pie/fPIE support... yes checking crt_externs.h usability... no checking crt_externs.h presence... no checking for crt_externs.h... no checking for _NSGetEnviron... no checking for vsnprintf... yes checking for snprintf... yes checking for X... libraries /usr/lib, headers . checking for IceConnectionNumber in -lICE... yes checking for libXext... yes checking for pthread_create in -lpthread... yes checking for extra includes... no checking for extra libs... no checking for libz... -lz checking for libpng... -lpng -lz -lm checking for libjpeg6b... no checking for libjpeg... -ljpeg checking for perl... /usr/bin/perl checking for Qt... configure: error: Qt (>= Qt 3.2 and < 4.0) (headers and libraries) not found. Please check your installation! For more details about this problem, look at the end of config.log. [root@localhost kmatrix3d]#