- Instead of forcefully adding
-Wall
-Wextra
-Wno-unused
-Wcast-qual
-Wcast-align
-Wbad-function-cast
-Wmissing-declarations
-Wmissing-prototypes
-Wnested-externs
-Wredundant-decls
-Wshadow
-Wwrite-strings
-Wundef
to CFLAGS, 'configure' now tests if the flags are understood by the compiler
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