1. download from http://web.engr.oregonstate.edu/~hess/ 2. $ make make -C ./src siftfeat make[1]: Entering directory `/mnt/disk/AIT/OpenCV/sift/src' gcc -O3 -I../include `pkg-config --cflags opencv` `pkg-config --cflags gtk+-2.0` `pkg-config --cflags gsl` -c xform.c -o xform.o Package gsl was not found in the pkg-config search path. Perhaps you should add the directory containing `gsl.pc' to the PKG_CONFIG_PATH environment variable No package 'gsl' found xform.c:16:24: error: gsl/gsl_sf.h: No such file or directory xform.c:17:25: error: gsl/gsl_rng.h: No such file or directory xform.c:18:29: error: gsl/gsl_randist.h: No such file or directory xform.c:27: error: expected declaration specifiers or ‘...’ before ‘gsl_rng’ xform.c: In function ‘ransac_xform’: xform.c:85: error: ‘gsl_rng’ undeclared (first use in this function) xform.c:85: error: (Each undeclared identifier is reported only once xform.c:85: error: for each function it appears in.) xform.c:85: error: ‘rng’ und...