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PKG_CHECK_MODULES([FFTW3], [fftw3], , [AC_MSG_ERROR([You must have libfftw3-dev installed])])
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LDFLAGS="$LDFLAGS `pkg-config fftw3 --libs`"
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PKG_CHECK_MODULES([XML2], [libxml-2.0 >= 2.6.0], , [AC_MSG_ERROR([You must have libxml2-dev >= 2.6 installed])])
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LDFLAGS="$LDFLAGS `pkg-config libxml-2.0 --libs`"
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# zlib - we assume it's installed on most systems