Add support for VPATH builds in contrib/minizip.
Instead of using relative paths directly, use paths relative to top_srcdir and top_builddir to refer to source files and built files, respectively. Note that the toplevel zlib configure script still does not have any special support for out-of-tree builds. But now you can do (cd contrib/minizip && autoreconf -fis) mkdir -p BUILD/test cp *.c *.h *.in zlib.map configure zlib.3 BUILD cp test/*.c BUILD/test (cd BUILD && ./configure --shared) (cd BUILD && make) mkdir -p BUILD/contrib/minizip cd BUILD/contrib/minizip ../../../contrib/minizip/configure make While at it, move the include path and library path settings to CPPFLAGS and LDFLAGS respectively instead of setting both in CFLAGS. Thanks to Mike Frysinger for advice.
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lib_LTLIBRARIES = libminizip.la
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zlib_top_srcdir = $(top_srcdir)/../..
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zlib_top_builddir = $(top_builddir)/../..
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AM_CPPFLAGS = -I$(zlib_top_srcdir)
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AM_LDFLAGS = -L$(zlib_top_builddir)
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libminizip_la_SOURCES = \
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ioapi.c \
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mztools.c \
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unzip.c \
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zip.c
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AM_CFLAGS = -I../.. -L../..
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libminizip_la_LDFLAGS = -version-info 1:0:0 -lz
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libminizip_la_LDFLAGS = $(AM_LDFLAGS) -version-info 1:0:0 -lz
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minizip_includedir = $(includedir)/minizip
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minizip_include_HEADERS = \
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