FVWM: what can I do ?

[d d]

checking for inttypes.h... yes 
checking for stdint.h... yes 
checking for unistd.h... yes 
checking minix/config.h usability... no 
checking minix/config.h presence... no 
checking for minix/config.h... no 
checking for X... no 

X11 libraries or header files could not be found.  Please make 
sure the X11 development package is installed on your system. 
If it is definitely installed, try setting the include and library 
paths with the --x-include and --x-libraries options of configure. 
Fvwm can not be compiled without the X11 development environment 

when I install fvwm show this, what is this ? what can I do ?

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