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add -no-undefined on cygwin and mingw, define CPPFLAGS on darwin
add -no-undefined on cygwin and mingw, define CPPFLAGS on darwin

--- a/configure.ac

+++ b/configure.ac

@@ -80,17 +80,20 @@

 AM_CONDITIONAL(MINGW, false)

 AM_CONDITIONAL(DARWIN, false)

-case "${host_os}" in

-*mingw*)

+case "${build_os}" in

+*mingw* | *cygwin*)

   mingw32_support="yes"

   AC_CHECK_HEADER(windows.h)

   AM_CONDITIONAL(MINGW, true)

+  LDFLAGS="$LDFLAGS -no-undefined"

   ;;

-*darwin*)

+*darwin* | *rhapsody* | *macosx*)

   dnl on macosx, cosf went to -lmx

   LDFLAGS="$LDFLAGS -lmx"

   dnl as long double doesn't sit well with -Wall -Werror

   AUBIO_CFLAGS="$AUBIO_CFLAGS -Wno-long-double"

+  dnl Workaround darwin autoconf bug

+  CPPFLAGS="$CPPFLAGS -I${prefix}/include"

   AC_ISC_POSIX

   AM_CONDITIONAL(DARWIN, true)

   ;;

@@ -105,7 +108,7 @@

 dnl Check for header files

 AC_HEADER_STDC

 AC_CHECK_HEADERS([string.h stdlib.h stdio.h math.h errno.h stdarg.h unistd.h signal.h],,)

-AC_CHECK_HEADERS(fftw3.h  ,,AC_MSG_ERROR([Ouch! missing fftw3.h header]))

+AC_CHECK_HEADERS(fftw3.h,,AC_MSG_ERROR([Ouch! missing fftw3.h header]))

 AC_ARG_ENABLE(complex,

   AC_HELP_STRING([--enable-complex],[compile with complex.h [[default=auto]]]),

   [with_complex=$enableval],