I followed these instructions. I edited the common.mak file successfully and when I ran make I get this error:

mohd-arafat-hossain@TUD:~/aircrack-ng-1.1$ make

make -C src all

make[1]: Entering directory `/home/mohd-arafat-hossain/aircrack-ng-1.1/src'

make -C osdep

make[2]: Entering directory `/home/mohd-arafat-hossain/aircrack-ng-1.1/src/osdep'

Building for Linux

make[3]: Entering directory `/home/mohd-arafat-hossain/aircrack-ng-1.1/src/osdep'

make[3]: `.os.Linux' is up to date.

make[3]: Leaving directory `/home/mohd-arafat-hossain/aircrack-ng-1.1/src/osdep'

make[2]: Leaving directory `/home/mohd-arafat-hossain/aircrack-ng-1.1/src/osdep'

gcc -g -W -Wall -O3 -D_FILE_OFFSET_BITS=64 -D_REVISION=0  -Iinclude   -c -o aircrack-ng.o aircrack-ng.c

In file included from aircrack-ng.c:65:0:

crypto.h:12:26: fatal error: openssl/hmac.h: No such file or directory

compilation terminated.

make[1]: *** [aircrack-ng.o] Error 1

make[1]: Leaving directory `/home/mohd-arafat-hossain/aircrack-ng-1.1/src'

make: *** [all] Error 2

What am I supposed to do now?