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--- a/Makefile	2020-11-05 08:48:00.592582924 +0200
+++ b/Makefile	2020-11-05 09:03:53.247026258 +0200
@@ -1,5 +1,5 @@
 # Installation directories following GNU conventions
-prefix ?= /usr/local
+prefix = /usr
 exec_prefix = $(prefix)
 bindir = $(exec_prefix)/bin
 sbindir = $(exec_prefix)/sbin
@@ -12,29 +12,30 @@
 OBJ=obj
 SRC=src
 
-CC ?= gcc
-CFLAGS ?= -Wextra -Wall -O2
+export CC
+export CFLAGS
+export LDFLAGS
 
 .PHONY: all install uninstall clean
 
 nms: $(OBJ)/input.o $(OBJ)/error.o $(OBJ)/nmscharset.o $(OBJ)/nmstermio.o $(OBJ)/nmseffect.o $(OBJ)/nms.o | $(BIN)
-	$(CC) $(CFLAGS) -o $(BIN)/$@ $^
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $(BIN)/$@ $^
 
 sneakers: $(OBJ)/nmscharset.o $(OBJ)/nmstermio.o $(OBJ)/nmseffect.o $(OBJ)/sneakers.o | $(BIN)
-	$(CC) $(CFLAGS) -o $(BIN)/$@ $^
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $(BIN)/$@ $^
 
 all: nms sneakers
 
 all-ncurses: nms-ncurses sneakers-ncurses
 
 nms-ncurses: $(OBJ)/input.o $(OBJ)/error.o $(OBJ)/nmscharset.o $(OBJ)/nmstermio_ncurses.o $(OBJ)/nmseffect.o $(OBJ)/nms.o | $(BIN)
-	$(CC) $(CFLAGS) -o $(BIN)/nms $^ -lncursesw
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $(BIN)/nms $^ -lncursesw
 
 sneakers-ncurses: $(OBJ)/nmscharset.o $(OBJ)/nmstermio_ncurses.o $(OBJ)/nmseffect.o $(OBJ)/sneakers.o | $(BIN)
-	$(CC) $(CFLAGS) -o $(BIN)/sneakers $^ -lncursesw
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $(BIN)/sneakers $^ -lncursesw
 
 $(OBJ)/%.o: $(SRC)/%.c | $(OBJ)
-	$(CC) $(CFLAGS) -o $@ -c $<
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ -c $<
 
 $(BIN):
 	mkdir $(BIN)