Adds -lm to the linker

Makefile

@@ -1,18 +1,19 @@
 CC=gcc
 SRCDIR=extensions
 CFLAGS=-std=c99 -g -ggdb -Wall -I$(SRCDIR)
+LDFLAGS=-lm
 
 test_objects=$(SRCDIR)/test.o $(SRCDIR)/spike.o $(SRCDIR)/utils.o $(SRCDIR)/gradient.o $(SRCDIR)/time_utils.o
 
 all: $(SRCDIR)/test
 
 $(SRCDIR)/test: $(test_objects)
-	$(CC) -o $(SRCDIR)/test $(test_objects)
+	$(CC) -o $(SRCDIR)/test $(LDFLAGS) $(test_objects)
 
 $(test_objects): %.o: %.c
 	$(CC) -o $@ $(CFLAGS) -c $<
 
 clean:
-	rm -rf $(SRCIDR)/*.o
+	rm -rf $(SRCDIR)/*.o
 	rm -rf $(SRCDIR)/test
 

setup.py

@@ -31,7 +31,7 @@
                      "extensions/time_utils.c",]
 
 
-qc_extension = Extension("ion_functions.qc.qc_extensions", extension_sources, include_dirs=[np.get_include(), "extensions/"])
+qc_extension = Extension("ion_functions.qc.qc_extensions", extension_sources, include_dirs=[np.get_include(), "extensions/"], libraries=["m"])
 
 
 setup(name = 'ion-functions',