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AC_DEFUN([TCLTLS_SSL_OPENSSL], [
dnl Use pkg-config to find the libraries
AC_ARG_VAR([TCLTLS_SSL_LIBS], [libraries to pass to the linker for OpenSSL or LibreSSL])
AC_ARG_VAR([TCLTLS_SSL_CFLAGS], [C compiler flags for OpenSSL or LibreSSL])
AC_ARG_VAR([TCLTLS_SSL_CPPFLAGS], [C preprocessor flags for OpenSSL or LibreSSL])
if test -z "$TCLTLS_SSL_LIBS"; then
TCLTLS_SSL_LIBS="`"${PKGCONFIG}" openssl --libs`" || AC_MSG_ERROR([Unable to get OpenSSL Configuration])
TCLTLS_SSL_CFLAGS="`"${PKGCONFIG}" openssl --cflags-only-other`" || AC_MSG_ERROR([Unable to get OpenSSL Configuration])
TCLTLS_SSL_CPPFLAGS="`"${PKGCONFIG}" openssl --cflags-only-I`" || AC_MSG_ERROR([Unable to get OpenSSL Configuration])
TCLTLS_SSL_LIBS="`"${PKGCONFIG}" openssl --libs`" || AC_MSG_ERROR([Unable to get OpenSSL Configuration])
fi
if test -z "$TCLTLS_SSL_CFLAGS"; then
TCLTLS_SSL_CFLAGS="`"${PKGCONFIG}" openssl --cflags-only-other`" || AC_MSG_ERROR([Unable to get OpenSSL Configuration])
fi
if test -z "$TCLTLS_SSL_CPPFLAGS"; then
TCLTLS_SSL_CPPFLAGS="`"${PKGCONFIG}" openssl --cflags-only-I`" || AC_MSG_ERROR([Unable to get OpenSSL Configuration])
fi
dnl Save compile-altering variables we are changing
SAVE_LIBS="${LIBS}"
SAVE_CFLAGS="${CFLAGS}"
SAVE_CPPFLAGS="${CPPFLAGS}"
dnl Update compile-altering variables to include the OpenSSL libraries
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