Add build system

Makefile

@@ -0,0 +1,25 @@
+CFLAGS ?= -Wall -Wextra -g -O1
+LDFLAGS ?= -g -O1
+LIB_CFLAGS ?= -fpic
+LIB_LDFLAGS ?= -shared
+ORDINARY_OBJS := ordinary
+
+.PHONY: all ordinary init clean
+
+all: ordinary
+
+ordinary: bin/libordinary.so
+
+init: bin
+
+bin:
+	mkdir -p -- bin
+
+bin/libordinary.so: $(addprefix bin/,$(addsuffix .o,$(ORDINARY_OBJS)))
+	cc $(LDFLAGS) $(LIB_LDFLAGS) -o $@ $^
+
+bin/%.o: src/%.c | init
+	cc $(CFLAGS) $(LIB_CFLAGS) -std=c99 -I include -c -o $@ $<
+
+clean:
+	rm -rf -- bin