bzlib.h fatal error

[CALeber]

Upon running this line of code while installing Gap2Seq: cd thirdparty/htslib; make; cd ..

I generate the below 'fatal error':

gcc -g -Wall -O2 -I. -c -o vcf.o vcf.c gcc -g -Wall -O2 -I. -c -o vcfutils.o vcfutils.c gcc -g -Wall -O2 -I. -c -o cram/cram_codecs.o cram/cram_codecs.c gcc -g -Wall -O2 -I. -c -o cram/cram_decode.o cram/cram_decode.c gcc -g -Wall -O2 -I. -c -o cram/cram_encode.o cram/cram_encode.c gcc -g -Wall -O2 -I. -c -o cram/cram_external.o cram/cram_external.c gcc -g -Wall -O2 -I. -c -o cram/cram_index.o cram/cram_index.c gcc -g -Wall -O2 -I. -c -o cram/cram_io.o cram/cram_io.c cram/cram_io.c:57:10: fatal error: bzlib.h: No such file or directory

include

      ^~~~~~~~~

compilation terminated. make: *** [Makefile:121: cram/cram_io.o] Error 1

Any ideas as to addressing this issue?

Thanks, Chris