debian:~/openbox-2.2.3# ./configure
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for gawk... no
checking for mawk... mawk
checking whether make sets $(MAKE)... yes
checking for gcc... gcc
checking for C compiler default output... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables...
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ANSI C... none needed
checking for style of include used by make... GNU
checking dependency style of gcc... gcc
checking for g++... no
checking for c++... no
checking for gpp... no
checking for aCC... no
checking for CC... no
checking for cxx... no
checking for cc++... no
checking for cl... no
checking for FCC... no
checking for KCC... no
checking for RCC... no
checking for xlC_r... no
checking for xlC... no
checking whether we are using the GNU C++ compiler... no
checking whether g++ accepts -g... no
checking dependency style of g++... none
checking for a BSD-compatible install... /usr/bin/install -c
checking whether to enable maintainer-specific portions of Makefiles... no
checking for sed... sed
checking how to run the C++ preprocessor... /lib/cpp
checking for egrep... grep -E
checking for ANSI C header files... no
checking for sys/types.h... no
checking for sys/stat.h... no
checking for stdlib.h... no
checking for string.h... no
checking for memory.h... no
checking for strings.h... no
checking for inttypes.h... no
checking for stdint.h... no
checking for unistd.h... no
checking ctype.h usability... no
checking ctype.h presence... yes
configure: WARNING: ctype.h: present but cannot be compiled
configure: WARNING: ctype.h: check for missing prerequisite headers?
configure: WARNING: ctype.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for ctype.h... yes
checking dirent.h usability... no
checking dirent.h presence... yes
configure: WARNING: dirent.h: present but cannot be compiled
configure: WARNING: dirent.h: check for missing prerequisite headers?
configure: WARNING: dirent.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for dirent.h... yes
checking fcntl.h usability... no
checking fcntl.h presence... yes
configure: WARNING: fcntl.h: present but cannot be compiled
configure: WARNING: fcntl.h: check for missing prerequisite headers?
configure: WARNING: fcntl.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for fcntl.h... yes
checking libgen.h usability... no
checking libgen.h presence... yes
configure: WARNING: libgen.h: present but cannot be compiled
configure: WARNING: libgen.h: check for missing prerequisite headers?
configure: WARNING: libgen.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for libgen.h... yes
checking locale.h usability... no
checking locale.h presence... yes
configure: WARNING: locale.h: present but cannot be compiled
configure: WARNING: locale.h: check for missing prerequisite headers?
configure: WARNING: locale.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for locale.h... yes
checking nl_types.h usability... no
checking nl_types.h presence... yes
configure: WARNING: nl_types.h: present but cannot be compiled
configure: WARNING: nl_types.h: check for missing prerequisite headers?
configure: WARNING: nl_types.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for nl_types.h... yes
checking process.h usability... no
checking process.h presence... no
checking for process.h... no
checking signal.h usability... no
checking signal.h presence... yes
configure: WARNING: signal.h: present but cannot be compiled
configure: WARNING: signal.h: check for missing prerequisite headers?
configure: WARNING: signal.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for signal.h... yes
checking stdarg.h usability... no
checking stdarg.h presence... yes
configure: WARNING: stdarg.h: present but cannot be compiled
configure: WARNING: stdarg.h: check for missing prerequisite headers?
configure: WARNING: stdarg.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for stdarg.h... yes
checking stdio.h usability... no
checking stdio.h presence... yes
configure: WARNING: stdio.h: present but cannot be compiled
configure: WARNING: stdio.h: check for missing prerequisite headers?
configure: WARNING: stdio.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for stdio.h... yes
checking for string.h... (cached) no
checking for stdlib.h... (cached) no
checking time.h usability... no
checking time.h presence... yes
configure: WARNING: time.h: present but cannot be compiled
configure: WARNING: time.h: check for missing prerequisite headers?
configure: WARNING: time.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for time.h... yes
checking for unistd.h... (cached) no
checking sys/param.h usability... no
checking sys/param.h presence... yes
configure: WARNING: sys/param.h: present but cannot be compiled
configure: WARNING: sys/param.h: check for missing prerequisite headers?
configure: WARNING: sys/param.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for sys/param.h... yes
checking sys/select.h usability... no
checking sys/select.h presence... yes
configure: WARNING: sys/select.h: present but cannot be compiled
configure: WARNING: sys/select.h: check for missing prerequisite headers?
configure: WARNING: sys/select.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for sys/select.h... yes
checking sys/signal.h usability... no
checking sys/signal.h presence... yes
configure: WARNING: sys/signal.h: present but cannot be compiled
configure: WARNING: sys/signal.h: check for missing prerequisite headers?
configure: WARNING: sys/signal.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for sys/signal.h... yes
checking for sys/stat.h... (cached) no
checking sys/time.h usability... no
checking sys/time.h presence... yes
configure: WARNING: sys/time.h: present but cannot be compiled
configure: WARNING: sys/time.h: check for missing prerequisite headers?
configure: WARNING: sys/time.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for sys/time.h... yes
checking for sys/types.h... (cached) no
checking sys/wait.h usability... no
checking sys/wait.h presence... yes
configure: WARNING: sys/wait.h: present but cannot be compiled
configure: WARNING: sys/wait.h: check for missing prerequisite headers?
configure: WARNING: sys/wait.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for sys/wait.h... yes
checking whether time.h and sys/time.h may both be included... no
checking for basename... no
checking for basename in -lgen... no
checking for getpid... no
checking for setlocale... no
checking for sigaction... no
checking for strftime... no
checking for strcasestr... no
checking for snprintf... no
checking for vsnprintf... no
checking for catopen... no
checking for catgets... no
checking for catclose... no
checking for t_open in -lnsl... no
checking for socket in -lsocket... no
checking for X... libraries /usr/X11R6/lib, headers /usr/X11R6/include
checking for dnet_ntoa in -ldnet... no
checking for dnet_ntoa in -ldnet_stub... no
checking for gethostbyname... no
checking for gethostbyname in -lnsl... no
checking for gethostbyname in -lbsd... no
checking for connect... no
checking for connect in -lsocket... no
checking for remove... no
checking for remove in -lposix... no
checking for shmat... no
checking for shmat in -lipc... no
checking for IceConnectionNumber in -lICE... no
checking for GCC... yes
checking for XOpenDisplay in -lX11... no
configure: error: Could not find XOpenDisplay in -lX11.

debian:~/openbox-2.2.3# apt-get install xlibs-dev
Reading Package Lists... Done
Building Dependency Tree... Done
Sorry, xlibs-dev is already the newest version.
0 packages upgraded, 0 newly installed, 0 to remove and 0  not upgraded.