diff --git a/Makefile b/Makefile
index 94c8446..cc6d976 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,6 @@
 .POSIX:
 .SUFFIXES:
 
-CC = cc
 VERSION = 1.0
 TARGET = 90s
 MANPAGE = $(TARGET).1
@@ -9,8 +8,7 @@ PREFIX ?= /usr/local
 BINDIR = $(PREFIX)/bin
 MANDIR = $(PREFIX)/share/man/man1
 
-# Flags
-CFLAGS = -O3 -march=native -mtune=native -pipe -s -flto -std=c99 -pedantic -Wall -D_DEFAULT_SOURCE -D_XOPEN_SOURCE=600 -DVERSION=$(VERSION)
+CFLAGS = -O3 -march=native -mtune=native -pipe -s -flto -std=c99 -pedantic -Wall -DVERSION=$(VERSION)
 
 SRC = src/*.c
 INCLUDE = include
@@ -34,11 +32,11 @@ install: $(TARGET)
 	chmod 644 $(DESTDIR)$(MANDIR)/$(MANPAGE)
 
 uninstall:
-	$(RM) $(DESTDIR)$(BINDIR)/$(TARGET)
-	$(RM) $(DESTDIR)$(MANDIR)/$(MANPAGE)
+	rm $(DESTDIR)$(BINDIR)/$(TARGET)
+	rm $(DESTDIR)$(MANDIR)/$(MANPAGE)
 
 clean:
-	$(RM) $(TARGET)
+	rm $(TARGET)
 
 all: $(TARGET)
 
diff --git a/src/90s.c b/src/90s.c
index a6cac0d..44acadf 100644
--- a/src/90s.c
+++ b/src/90s.c
@@ -3,7 +3,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
-#include <linux/limits.h>
+#include <limits.h>
 #include <time.h>
 #include <stdbool.h>
 #include <signal.h>
diff --git a/src/history.c b/src/history.c
index abe87a3..709ba13 100644
--- a/src/history.c
+++ b/src/history.c
@@ -3,7 +3,7 @@
 #include <stdbool.h>
 #include <string.h>
 #include <unistd.h>
-#include <linux/limits.h>
+#include <limits.h>
 
 #include "history.h"
 #include "90s.h"