diff --git a/Makefile b/Makefile
index 4c62e57..5aa38ee 100644
--- a/Makefile
+++ b/Makefile
@@ -3,6 +3,7 @@
 CFLAGS =		-std=c99 -Iinclude -pedantic
 WARNINGS= 	-Wall -Wextra
 LDFLAGS =		-fPIC -shared
+MACROS= 		-D_POSIX_C_SOURCE=1
 
 TARGET = 	libflint.so
 SRC !=		ls src/*.c
@@ -11,10 +12,15 @@ OBJ =			$(SRC:./src/$.c=./obj/%.o)
 PREFIX =	$(DESTDIR)/usr/local
 LIBDIR =	$(PREFIX)/lib
 
+OS_NAME != uname -s | tr A-Z a-z
+
 all: $(TARGET)
 	./clanggen.sh
 
 $(TARGET): $(OBJ)
+  ifeq ($(OS_NAME),"openbsd")
+	@echo "Building for openbsd"
+endif
 	cc $(CFLAGS) $(WARNINGS) $(LDFLAGS) -o $(TARGET) $(OBJ)
 
 ./obj/%.o: ./src/%.c
@@ -40,3 +46,4 @@ tests:
 
 manual:
 	cc $(CFLAGS) -o netmanual tests/netmanual.c src/*.c
+
diff --git a/src/network.c b/src/network.c
index 46c8654..637ed17 100644
--- a/src/network.c
+++ b/src/network.c
@@ -1,8 +1,3 @@
-// Needed for sigaction on Linux
-#ifdef __linux__
-#define _POSIX_C_SOURCE 1
-#endif // __linux__
-
 #include <errno.h>
 #include <string.h>
 #include <stdlib.h>