fix Makefile and README.md for 2015/endoh4

2015/endoh4/Makefile

@@ -63,20 +63,21 @@ X11_INCDIR= /opt/X11/include
 # Common C compiler warnings to silence
 #
 #CSILENCE=
-CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-main -Wno-return-type
+CSILENCE= -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int \
+	-Wno-main -Wno-pedantic -Wno-return-type
 
 # Common C compiler warning flags
 #
 #CWARN= ${CSILENCE}
 #CWARN= -Wall ${CSILENCE}
-CWARN= -Wall -Wextra ${CSILENCE}
-#CWARN= -Wall -Wextra -pedantic ${CSILENCE}
+#CWARN= -Wall -Wextra ${CSILENCE}
+CWARN= -Wall -Wextra -pedantic ${CSILENCE}
 
 # Compiler standard
 #
 #CSTD=
 #CSTD= -ansi
-CSTD= -std=gnu90
+CSTD= -std=gnu11
 
 # Compiler bit architecture
 #
@@ -101,8 +102,8 @@ CINCLUDE=
 #CINCLUDE= -include stdlib.h
 #CINCLUDE= -include stdio.h
 #CINCLUDE= -include stdlib.h -include stdio.h
-#CINCLUDE= -I ${X11_INCDIR}
-#CINCLUDE= -I ${HOMEBREW_PREFIX}/include/SDL2
+#CINCLUDE= -I ${X11_INCDIR} -I ${X11_INCDIR}/X11
+#CINCLUDE= `${SDL2_CONFIG} --cflags`
 
 # Optimization
 #
@@ -126,7 +127,7 @@ CFLAGS= ${CSTD} ${CWARN} ${ARCH} ${CDEFINE} ${CINCLUDE} ${OPT}
 LIBS=
 #LIBS= -lm
 #LIBS= -L ${X11_LIBDIR} -lX11
-#LIBS= -L ${HOMEBREW_PREFIX}/lib -lSDL
+#LIBS= `${SDL2_CONFIG} --libs`
 
 # C compiler to use
 #
@@ -138,8 +139,8 @@ CC= cc
 #
 ifeq ($(CC),clang)
 #
-CSILENCE+= -Wno-comma -Wno-missing-prototypes -Wno-pedantic \
-	-Wno-poison-system-directories -Wno-strict-prototypes
+CSILENCE+= -Wno-comma -Wno-missing-prototypes -Wno-poison-system-directories \
+	-Wno-strict-prototypes
 #
 CWARN+= -Weverything
 #
@@ -167,8 +168,8 @@ OBJ= ${PROG}.o
 DATA=
 TARGET= ${PROG}
 #
-ALT_OBJ= ${PROG}.alt.o
-ALT_TARGET= ${PROG}.alt
+ALT_OBJ=
+ALT_TARGET=
 
 
 #################
@@ -185,9 +186,6 @@ all: data ${TARGET}
 ${PROG}: ${PROG}.c
 	${CC} ${CFLAGS} $< -o $@ ${LIBS}
 
-${PROG}.alt: ${PROG}.alt.c
-	${CC} ${CFLAGS} $< -o $@ ${LIBS}
-
 # alternative executable
 #
 alt: data ${ALT_TARGET}
@@ -327,4 +325,3 @@ pluto: charon
 	@echo "dwarf is a type of planet"
 	@echo "therefore, $@ is a planet"
 	@echo "having lots of planets is good feature because supernovae can help ${MAKE} a lot of them"
-