GNU scientific library linking

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http://unix.stackexchange.com – I have installed GNU scientific library (http://www.gnu.org/software/gsl/) which is located in /home/usr/gsl-1.9 and installed statistical programme in /home/usr/statprog when I tried to compile it, this happens: $ cd home/usr/statprog $ make gcc -O3 -Wall -Wshadow -pedantic D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -DVER32 -I/opt/local/include/ -L/opt/local/lib/ -c -o mlRho.o mlRho.c gcc: error: D_GNU_SOURCE: No such file or directory make: *** [mlRho.o] Error 1 It says no such file or directory. How to link GNU library to this statprog? (HowTos)