From Genome Analysis Wiki
===error: zlib.h: No such file or directory===
make: *** [samtools] Error 2
make: *** [../../libStatGen/libStatGen. a] Error 2
If you are using version 0.4. 4 and under, please go to our wiki page to download the newest version [[RAREMETAL]]. There was a bug in makefile in older versions of RAREMETAL that could cause this error and it has been fixed. For a quick fix, please go to / raremetal/ src and open "Makefile". Then comment out the lines at the bottom of raremetal/ src/ Makefile that set LD_LIBRARY_PATH. Try compiling and see if it works.