[Xastir] install help

[Shawn Hudson]

Hello folks.. I can't say I'm a wizard at linux so forgive me if this seems
basic.

I am running in to this error when I do a ./configure
I know I have X11 because the comand was issued in a iceWM  window... what
is wrong?

Thanks for any help

Shawn

Here is the last part of the output form the ./configure:

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 how to run the C preprocessor... gcc -E
checking for a BSD-compatible install... /usr/bin/install -c
checking whether ln -s works... yes
checking whether make sets $(MAKE)... (cached) yes
checking for gawk... (cached) mawk
checking for devices... found /dev/ttyS0 and /dev/ttyS1
checking for search paths... done
checking for the pthreads library -lpthreads... no
checking whether pthreads work without any flags... no
checking whether pthreads work with -Kthread... no
checking whether pthreads work with -kthread... no
checking for the pthreads library -llthread... no
checking whether pthreads work with -pthread... yes
checking for joinable pthread attribute... PTHREAD_CREATE_JOINABLE
checking if more special flags are required for pthreads... no
checking for cc_r... gcc
checking for compiler flags... using -g -O2 -pipe -Wall -pthread
checking for system... Linux
checking for wget... /usr/bin/wget
checking for convert... no
checking for lpr... no
checking for gv... no
checking for cp... /bin/cp
checking for cat... /bin/cat
checking for festival... no
checking for gpsman... no
checking for X... no
configure: error: *** No X11!  Install X-Windows development
headers/libraries!
***
io:/usr/local/xastir/xastir-1.3.1#

This is a far as I get..