title: fatal error: zlib.h: No such file or directory when zlib is installed
body: <p>Using CentOS 7.
  Installed zlib-devel, but still getting following error when trying to install softwares.</p>
  
  <pre><code>&gt; make
  make -C lib/utils libutils.a
  make[1]: Entering directory '/common/apps/biscuit/lib/utils'
  gcc -c -Wall -O2 wzvcf.c -o wzvcf.o
  In file included from wzvcf.h:29:0,
               from wzvcf.c:1:
  wzio.h:4:10: fatal error: zlib.h: No such file or directory
   #include &lt;zlib.h&gt;
        ^~~~~~~~
  compilation terminated.
  make[1]: *** [Makefile:17: wzvcf.o] Error 1
  make[1]: Leaving directory '/common/apps/biscuit/lib/utils'
  make: *** [Makefile:60: lib/utils/libutils.a] Error 2
  </code></pre>
  
  <p>Also added -I/hpc/apps/zlib/1.2.11/include -I/usr/include to Makefile as following:</p>
  
  <pre><code>CC = gcc
  CFLAGS = -W -Wall -finline-functions -fPIC -std=gnu99 -Wno-unused-result -O3 -I/hpc/apps/zlib/1.2.11/include -I/usr/include
  CLIB = -lncurses -lpthread -lz -lm
  CF_OPTIMIZE = 1
  
  </code></pre>