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       else
         AC_CHECK_PROG([PORT], port, port)
         # If homebrew isn't installed and macports is, add the macports default paths
         # as a last resort.
         if test x$PORT = xport; then
           CPPFLAGS="$CPPFLAGS -isystem /opt/local/include"
           LDFLAGS="$LDFLAGS -L/opt/local/lib"
         fi
       fi
     fi
   ;;
   cygwin*|mingw*)
     build_windows=yes
   ;;
esac

# Try if some desirable compiler flags are supported and append them to SECP_CFLAGS.
#
# These are our own flags, so we append them to our own SECP_CFLAGS variable (instead of CFLAGS) as
# recommended in the automake manual (Section "Flag Variables Ordering"). CFLAGS belongs to the user
# and we are not supposed to touch it. In the Makefile, we will need to ensure that SECP_CFLAGS
# is prepended to CFLAGS when invoking the compiler so that the user always has the last word (flag).
#
# Another advantage of not touching CFLAGS is that the contents of CFLAGS will be picked up by
# libtool for compiling helper executables. For example, when compiling for Windows, libtool will
# generate entire wrapper executables (instead of simple wrapper scripts as on Unix) to ensure
# proper operation of uninstalled programs linked by libtool against the uninstalled shared library.
# These executables are compiled from C source file for which our flags may not be appropriate,
# e.g., -std=c89 flag has lead to undesirable warnings in the past.
#
# TODO We should analogously not touch CPPFLAGS and LDFLAGS but currently there are no issues.
AC_DEFUN([SECP_TRY_APPEND_DEFAULT_CFLAGS], [
    # GCC and compatible (incl. clang)
    if test "x$GCC" = "xyes"; then
      # Try to append -Werror to CFLAGS temporarily. Otherwise checks for some unsupported
      # flags will succeed.
      # Note that failure to append -Werror does not necessarily mean that -Werror is not
      # supported. The compiler may already be warning about something unrelated, for example
      # about some path issue. If that is the case, -Werror cannot be used because all
      # of those warnings would be turned into errors.
      SECP_TRY_APPEND_DEFAULT_CFLAGS_saved_CFLAGS="$CFLAGS"
      SECP_TRY_APPEND_CFLAGS([-Werror], CFLAGS)

      SECP_TRY_APPEND_CFLAGS([-std=c89 -pedantic -Wno-long-long -Wnested-externs -Wshadow -Wstrict-prototypes -Wundef], $1) # GCC >= 3.0, -Wlong-long is implied by -pedantic.
      SECP_TRY_APPEND_CFLAGS([-Wno-overlength-strings], $1) # GCC >= 4.2, -Woverlength-strings is implied by -pedantic.
      SECP_TRY_APPEND_CFLAGS([-Wall], $1) # GCC >= 2.95 and probably many other compilers
      SECP_TRY_APPEND_CFLAGS([-Wno-unused-function], $1) # GCC >= 3.0, -Wunused-function is implied by -Wall.
      SECP_TRY_APPEND_CFLAGS([-Wextra], $1) # GCC >= 3.4, this is the newer name of -W, which we don't use because older GCCs will warn about unused functions.
      SECP_TRY_APPEND_CFLAGS([-Wcast-align], $1) # GCC >= 2.95
      SECP_TRY_APPEND_CFLAGS([-Wcast-align=strict], $1) # GCC >= 8.0
      SECP_TRY_APPEND_CFLAGS([-Wconditional-uninitialized], $1) # Clang >= 3.0 only
      SECP_TRY_APPEND_CFLAGS([-Wreserved-identifier], $1) # Clang >= 13.0 only
      SECP_TRY_APPEND_CFLAGS([-fvisibility=hidden], $1) # GCC >= 4.0

      CFLAGS="$SECP_TRY_APPEND_DEFAULT_CFLAGS_saved_CFLAGS"
    fi

    # MSVC
    # Assume MSVC if we're building for Windows but not with GCC or compatible;
    # libtool makes the same assumption internally.
    # Note that "/opt" and "-opt" are equivalent for MSVC; we use "-opt" because "/opt" looks like a path.
    if test x"$GCC" != x"yes" && test x"$build_windows" = x"yes"; then
      SECP_TRY_APPEND_CFLAGS([-W3], $1) # Production quality warning level.
      SECP_TRY_APPEND_CFLAGS([-wd4146], $1) # Disable warning C4146 "unary minus operator applied to unsigned type, result still unsigned".
      SECP_TRY_APPEND_CFLAGS([-wd4244], $1) # Disable warning C4244 "'conversion' conversion from 'type1' to 'type2', possible loss of data".
      SECP_TRY_APPEND_CFLAGS([-wd4267], $1) # Disable warning C4267 "'var' : conversion from 'size_t' to 'type', possible loss of data".
      # Eliminate deprecation warnings for the older, less secure functions.
      CPPFLAGS="-D_CRT_SECURE_NO_WARNINGS $CPPFLAGS"
    fi
])
SECP_TRY_APPEND_DEFAULT_CFLAGS(SECP_CFLAGS)

###
### Define config arguments
###

# In dev mode, we enable all binaries and modules by default but individual options can still be overridden explicitly.
# Check for dev mode first because SECP_SET_DEFAULT needs enable_dev_mode set.
AC_ARG_ENABLE(dev_mode, [], [],
    [enable_dev_mode=no])

AC_ARG_ENABLE(benchmark,
    AS_HELP_STRING([--enable-benchmark],[compile benchmark [default=yes]]), [],
    [SECP_SET_DEFAULT([enable_benchmark], [yes], [yes])])

AC_ARG_ENABLE(coverage,
    AS_HELP_STRING([--enable-coverage],[enable compiler flags to support kcov coverage analysis [default=no]]), [],
    [SECP_SET_DEFAULT([enable_coverage], [no], [no])])

AC_ARG_ENABLE(tests,
    AS_HELP_STRING([--enable-tests],[compile tests [default=yes]]), [],
    [SECP_SET_DEFAULT([enable_tests], [yes], [yes])])

AC_ARG_ENABLE(ctime_tests,
    AS_HELP_STRING([--enable-ctime-tests],[compile constant-time tests [default=yes if valgrind enabled]]), [],
    [SECP_SET_DEFAULT([enable_ctime_tests], [auto], [auto])])

AC_ARG_ENABLE(experimental,
    AS_HELP_STRING([--enable-experimental],[allow experimental configure options [default=no]]), [],
    [SECP_SET_DEFAULT([enable_experimental], [no], [yes])])

AC_ARG_ENABLE(exhaustive_tests,
    AS_HELP_STRING([--enable-exhaustive-tests],[compile exhaustive tests [default=yes]]), [],
    [SECP_SET_DEFAULT([enable_exhaustive_tests], [yes], [yes])])

AC_ARG_ENABLE(examples,
    AS_HELP_STRING([--enable-examples],[compile the examples [default=no]]), [],
    [SECP_SET_DEFAULT([enable_examples], [no], [yes])])

AC_ARG_ENABLE(module_ecdh,
    AS_HELP_STRING([--enable-module-ecdh],[enable ECDH module [default=yes]]), [],
    [SECP_SET_DEFAULT([enable_module_ecdh], [yes], [yes])])

AC_ARG_ENABLE(module_recovery,
    AS_HELP_STRING([--enable-module-recovery],[enable ECDSA pubkey recovery module [default=no]]), [],
    [SECP_SET_DEFAULT([enable_module_recovery], [no], [yes])])

AC_ARG_ENABLE(module_extrakeys,
    AS_HELP_STRING([--enable-module-extrakeys],[enable extrakeys module [default=yes]]), [],
    [SECP_SET_DEFAULT([enable_module_extrakeys], [yes], [yes])])