o a exe do gitignore

.gitignore

@@ -14,3 +14,5 @@ build/
 *.out
 *.synctex.gz
 *.toc
+*.o
+*.exe

Makefile

@@ -0,0 +1,12 @@
+CC = gcc
+CFLAGS = -Wall -pedantic
+LDFLAGS = -lm
+BIN = graph.exe
+OBJ = errors.o lex.o main.o math_functions.o parser.o ps_graph.o tree.o
+
+%.o: %.c
+	$(CC) -c $(CFLAGS) $< -o $@
+
+$(BIN): $(OBJ)
+	$(CC) $^ -o $@ $(LDFLAGS)
+

Makefile.win

@@ -0,0 +1,9 @@
+BIN = graph.exe
+OBJ = errors.o lex.o main.o math_functions.o parser.o ps_graph.o tree.o
+
+.c.obj:
+	cl $< /c
+
+$(BIN): $(OBJ)
+	cl $(OBJ) /Fe$(BIN)
+

ps_graph.c

@@ -1,5 +1,6 @@
 #include "ps_graph.h"
 #include <math.h>
+#include <stdio.h>
 
 #define TEMP_BUF_SIZE  128