-echo -ggdb3 -Wall -fsanitize=address -fpic -shared -o ext/csRadarFree.so ext_csr_free.c -lm
-gcc -ggdb3 -Wall -fsanitize=address -fpic -shared -o ext/csRadarFree.so ext_csr_free.c -lm
+echo build: ext/csr_substance.so
+gcc $flags -fpic -shared -o ext/csr_substance.so ext_csr_substance.c -lm