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https://github.com/moparisthebest/curl
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Autoconf redefines the M4 builtin macro 'm4_undefine' in such a way that
it fails if the macro that is being undefined is not already defined. To make this work under all cases and be sure that at a certain point some specific macro isn't defined we must use the following style in configure: m4_ifdef([macro], [m4_undefine([macro])])
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@ -64,11 +64,15 @@ AC_HELP_STRING([--disable-debug],[Disable debug options]),
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dnl skip libtool C++ and Fortran compiler checks
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dnl skip libtool C++ and Fortran compiler checks
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m4_ifdef([AC_PROG_CXX], [m4_undefine([AC_PROG_CXX])])
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m4_defun([AC_PROG_CXX],[])
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m4_defun([AC_PROG_CXX],[])
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m4_ifdef([AC_PROG_F77], [m4_undefine([AC_PROG_F77])])
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m4_defun([AC_PROG_F77],[])
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m4_defun([AC_PROG_F77],[])
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dnl skip libtool C++ and Fortran linker checks
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dnl skip libtool C++ and Fortran linker checks
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m4_ifdef([AC_LIBTOOL_CXX], [m4_undefine([AC_LIBTOOL_CXX])])
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m4_defun([AC_LIBTOOL_CXX],[])
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m4_defun([AC_LIBTOOL_CXX],[])
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m4_ifdef([AC_LIBTOOL_F77], [m4_undefine([AC_LIBTOOL_F77])])
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m4_defun([AC_LIBTOOL_F77],[])
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m4_defun([AC_LIBTOOL_F77],[])
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dnl libtool setup
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dnl libtool setup
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@ -116,11 +116,15 @@ dnl support building of Windows DLLs
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AC_LIBTOOL_WIN32_DLL
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AC_LIBTOOL_WIN32_DLL
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dnl skip libtool C++ and Fortran compiler checks
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dnl skip libtool C++ and Fortran compiler checks
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m4_ifdef([AC_PROG_CXX], [m4_undefine([AC_PROG_CXX])])
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m4_defun([AC_PROG_CXX],[])
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m4_defun([AC_PROG_CXX],[])
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m4_ifdef([AC_PROG_F77], [m4_undefine([AC_PROG_F77])])
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m4_defun([AC_PROG_F77],[])
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m4_defun([AC_PROG_F77],[])
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dnl skip libtool C++ and Fortran linker checks
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dnl skip libtool C++ and Fortran linker checks
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m4_ifdef([AC_LIBTOOL_CXX], [m4_undefine([AC_LIBTOOL_CXX])])
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m4_defun([AC_LIBTOOL_CXX],[])
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m4_defun([AC_LIBTOOL_CXX],[])
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m4_ifdef([AC_LIBTOOL_F77], [m4_undefine([AC_LIBTOOL_F77])])
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m4_defun([AC_LIBTOOL_F77],[])
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m4_defun([AC_LIBTOOL_F77],[])
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dnl libtool setup
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dnl libtool setup
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