Clean up SDL infrastructure, add makefiles for more system/cpu combinations

Rationalize the SDL.h include file references so that they work on all systems

Use the correct macOS Framework options to get include path and library search path

Add makefile fragments for SDL on macOS on Apple Silicon, plus FreeBSD and Linux
on same cpus as X11

Switch to gcc rather than clang as the default compiler for Linux systems

bin/makefile-cygwin.x86_64-x

@@ -1,7 +1,7 @@
 # Options for Linux, Intel x86_64 and X-Window
 
 #CC = gcc -m64 $(GCC_CFLAGS)
-CC = clang -m64 $(CLANG_CFLAGS) -DMAIKO_ENABLE_NETHUB
+CC = clang -m64 $(CLANG_CFLAGS)
 
 XFILES = $(OBJECTDIR)xmkicon.o \
 	$(OBJECTDIR)xbbt.o \

bin/makefile-darwin.aarch64-sdl

@@ -0,0 +1,19 @@
+# Options for MacOS, x86 processor, SDL
+
+CC = clang $(CLANG_CFLAGS)
+
+XFILES = $(OBJECTDIR)sdl.o
+
+SDLFLAGS = -DSDL -F /Library/Frameworks
+
+# OPTFLAGS is normally -O2.
+OPTFLAGS =  -O2 -g
+DEBUGFLAGS = # -DDEBUG -DOPTRACE
+DFLAGS = $(DEBUGFLAGS) $(SDLFLAGS) -DRELEASE=351
+
+LDFLAGS = -F /Library/Frameworks -framework SDL2
+LDELDFLAGS =
+
+OBJECTDIR = ../$(RELEASENAME)/
+
+default	: ../$(OSARCHNAME)/lde ../$(OSARCHNAME)/ldesdl

bin/makefile-darwin.x86_64-sdl

@@ -1,17 +1,17 @@
-# Options for MacOS, x86 processor, X windows
+# Options for MacOS, x86 processor, SDL
 
 CC = clang -m64 $(CLANG_CFLAGS)
 
 XFILES = $(OBJECTDIR)sdl.o
 
-SDLFLAGS = -DSDL -I/Library/Frameworks/SDL2.framework/Headers
+SDLFLAGS = -DSDL -F /Library/Frameworks
 
 # OPTFLAGS is normally -O2.
-OPTFLAGS =  -O1 -g
+OPTFLAGS =  -O2 -g
 DEBUGFLAGS = # -DDEBUG -DOPTRACE
 DFLAGS = $(DEBUGFLAGS) $(SDLFLAGS) -DRELEASE=351
 
-LDFLAGS = -F/Library/Frameworks -framework SDL2
+LDFLAGS = -F /Library/Frameworks -framework SDL2
 LDELDFLAGS =
 
 OBJECTDIR = ../$(RELEASENAME)/

bin/makefile-freebsd.386-sdl

@@ -0,0 +1,18 @@
+# Options for FreeBSD, Intel 386/486 and SDL
+
+CC = clang -m32 $(CLANG_CFLAGS)
+
+XFILES = $(OBJECTDIR)sdl.o
+
+SDLFLAGS = -DSDL -I/usr/local/include
+
+# OPTFLAGS is normally -O2.
+OPTFLAGS = -O2 -g
+DFLAGS = $(SDLFLAGS) -DRELEASE=351
+
+LDFLAGS = -L/usr/local/lib -lSDL2 -lm
+LDELDFLAGS =
+
+OBJECTDIR = ../$(RELEASENAME)/
+
+default	: ../$(OSARCHNAME)/lde ../$(OSARCHNAME)/ldesdl

bin/makefile-freebsd.aarch64-sdl

@@ -0,0 +1,18 @@
+# Options for FreeBSD, ARM64 and SDL
+
+CC = clang -m64 $(CLANG_CFLAGS)
+
+XFILES = $(OBJECTDIR)sdl.o
+
+SDLFLAGS = -DSDL -I/usr/local/include
+
+# OPTFLAGS is normally -O2.
+OPTFLAGS = -O2 -g
+DFLAGS = $(SDLFLAGS) -DRELEASE=351
+
+LDFLAGS = -L/usr/local/lib -lSDL2 -lm
+LDELDFLAGS =
+
+OBJECTDIR = ../$(RELEASENAME)/
+
+default	: ../$(OSARCHNAME)/lde ../$(OSARCHNAME)/ldesdl

bin/makefile-freebsd.x86_64-sdl

@@ -0,0 +1,18 @@
+# Options for FreeBSD, Intel x86_64 and X-Windows
+
+CC = clang -m64 $(CLANG_CFLAGS)
+
+XFILES = $(OBJECTDIR)sdl.o
+
+SDLFLAGS = -DSDL -I/usr/local/include
+
+# OPTFLAGS is normally -O2.
+OPTFLAGS = -O2 -g
+DFLAGS = $(SDLFLAGS) -DRELEASE=351
+
+LDFLAGS = -L/usr/local/lib -lSDL2 -lm
+LDELDFLAGS =
+
+OBJECTDIR = ../$(RELEASENAME)/
+
+default	: ../$(OSARCHNAME)/lde ../$(OSARCHNAME)/ldesdl

bin/makefile-linux.386-sdl

@@ -0,0 +1,19 @@
+# Options for Linux, Intel 386/486 and SDL
+
+CC = gcc -m32 $(GCC_CFLAGS)
+# CC = clang $(CLANG_CFLAGS)
+
+XFILES = $(OBJECTDIR)sdl.o
+
+XFLAGS = -DSDL
+
+# OPTFLAGS is normally -O2.
+OPTFLAGS =  -O2 -g3
+DFLAGS = $(XFLAGS) -DRELEASE=351
+
+LDFLAGS = -lm -lSDL2
+LDELDFLAGS =
+
+OBJECTDIR = ../$(RELEASENAME)/
+
+default	: ../$(OSARCHNAME)/lde ../$(OSARCHNAME)/ldesdl

bin/makefile-linux.386-x

@@ -1,7 +1,8 @@
 # Options for Linux, Intel 386/486 and X-Window
 
-#CC = gcc -m32 $(GCC_CFLAGS)
-CC = clang -m32 $(CLANG_CFLAGS)
+CC = gcc -m32 $(GCC_CFLAGS)
+# CC = clang -m32 $(CLANG_CFLAGS)
+
 XFILES = $(OBJECTDIR)xmkicon.o \
 	$(OBJECTDIR)xbbt.o \
 	$(OBJECTDIR)dspif.o \
@@ -12,7 +13,6 @@ XFILES = $(OBJECTDIR)xmkicon.o \
 	$(OBJECTDIR)xrdopt.o \
 	$(OBJECTDIR)xwinman.o
 
-
 XFLAGS = -DXWINDOW
 
 # OPTFLAGS is normally -O2.

bin/makefile-linux.aarch64-sdl

@@ -0,0 +1,19 @@
+# Options for Linux, ARM64 and SDL
+
+CC = gcc $(GCC_CFLAGS)
+#CC = clang $(CLANG_CFLAGS)
+
+XFILES = $(OBJECTDIR)sdl.o
+
+SDLFLAGS = -DSDL
+
+# OPTFLAGS is normally -O2.
+OPTFLAGS =  -O2 -g3
+DFLAGS = $(SDLFLAGS) -DRELEASE=351
+
+LDFLAGS = -lSDL2 -lm
+LDELDFLAGS =
+
+OBJECTDIR = ../$(RELEASENAME)/
+
+default	: ../$(OSARCHNAME)/lde ../$(OSARCHNAME)/ldesdl

bin/makefile-linux.armv7l-sdl

@@ -0,0 +1,19 @@
+# Options for Linux, ARMv7 and SDL
+
+CC = gcc $(GCC_CFLAGS)
+#CC = clang $(CLANG_CFLAGS)
+
+XFILES = $(OBJECTDIR)sdl.o
+
+XFLAGS = -DSDL
+
+# OPTFLAGS is normally -O2.
+OPTFLAGS =  -O2 -g3
+DFLAGS = $(XFLAGS) -DRELEASE=351
+
+LDFLAGS = -lm -lSDL2
+LDELDFLAGS =
+
+OBJECTDIR = ../$(RELEASENAME)/
+
+default	: ../$(OSARCHNAME)/lde ../$(OSARCHNAME)/ldesdl

bin/makefile-linux.x86_64-sdl

@@ -0,0 +1,19 @@
+# Options for Linux, Intel x86_64 and SDL
+
+CC = gcc -m64 $(GCC_CFLAGS)
+# CC = clang -m64 $(CLANG_CFLAGS)
+
+XFILES = $(OBJECTDIR)sdl.o
+
+XFLAGS = -DSDL
+
+# OPTFLAGS is normally -O2.
+OPTFLAGS =  -O2 -g3
+DFLAGS = $(XFLAGS) -DRELEASE=351
+
+LDFLAGS = -lm -lSDL2
+LDELDFLAGS =
+
+OBJECTDIR = ../$(RELEASENAME)/
+
+default	: ../$(OSARCHNAME)/lde ../$(OSARCHNAME)/ldesdl

bin/makefile-linux.x86_64-x

@@ -1,7 +1,7 @@
 # Options for Linux, Intel x86_64 and X-Window
 
-#CC = gcc -m64 $(GCC_CFLAGS)
-CC = clang -m64 $(CLANG_CFLAGS) -DMAIKO_ENABLE_NETHUB
+CC = gcc -m64 $(GCC_CFLAGS)
+# CC = clang -m64 $(CLANG_CFLAGS)
 
 XFILES = $(OBJECTDIR)xmkicon.o \
 	$(OBJECTDIR)xbbt.o \