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Makefile.in

Makefile.in is generated by automake out of configure.in and Makefile.am. Makefile.in supports all the standard targets.
Makefile.in is turned into the Makefile through config.status.

Some common keywords

@srcdir@

The directory containing the source files.

@CC@

The C compiler to use.

@CXX@

The C++ compiler to use.

@CFLAGS@

Flags to pass to the C compiler.

@CXXFLAGS@

Flags to pass to the C++ compiler.

@CPP@

The C preprocessor to use (e.g. "gcc -E").

@CPPFLAGS@

C preprocessor flags, like -I directives.

@DEFS@

Usually "-DHAVE_CONFIG_H" if AC_CONFIG_HEADER is used.

@LDFLAGS@

Flags to pass to the linker.

@LIBS@

Libraries to link the program against.

@LIBOBJS@

Additional objects containing missing functions.

@RANLIB@

The ranlib program to use

@INSTALL@

The install program, or install-sh script.

@SET_MAKE@

"MAKE=make" (or whatever) if make does not set ${MAKE}.