README.md: document requirement on make command
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README.md
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README.md
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@ -71,6 +71,28 @@ additional information on stdout.
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This requires: libjpeg, libpng, SDL
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Build-time requirements
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-----------------------
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### make
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While we are trying to keep our makefiles portable,
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it might be incompatible with some versions of make.
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#### GNU make
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Version 4.x and later works. We recommend to use it.
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Version prior to 4.0 doesn't work because it doesn't support `!=`.
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*Note*: macOS's default version of make is GNU make 3.81 as of writing this.
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#### BSD make
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It also works.
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You might need to specify the `-r` make option because some of
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the default macros like CFLAGS from sys.mk can cause unintended effects.
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Installation
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------------
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To build the library and associated demos/tests, type `make`. If you need to
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