X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=autogen.sh;h=26e179361e3d35d6404ed94e25f1190f7bb9a6e7;hb=329733d92c5004f0fe308eff26b9537fded2cdf3;hp=8685c3c8f7cabd2822a7e9a6468895443ff82a98;hpb=baa0c2ae677940345d2ec62b0b6fdf17e7d2d09d;p=libsigrok.git

diff --git a/autogen.sh b/autogen.sh
index 8685c3c8..26e17936 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -58,16 +58,18 @@ aclocal ${ACLOCAL_DIR} || exit 1
 # Check the version of a specific autoconf macro that tends to cause problems.
 CXXMACROVERSION=$(
 	grep -B 5 'm4_define(\[_AX_CXX_COMPILE_STDCXX_11_testbody\]' aclocal.m4 |
-	sed -nr 's/.*serial[[:space:]]+([[:digit:]]+).*/\1/p'
+	sed -n 's/.*serial[ \t][ \t]*\([0-9][0-9]*\).*/\1/p'
 )
 if [ "x$CXXMACROVERSION" = "x" ]; then
 	echo "--- Warning: AX_CXX_COMPILE_STDCXX_11 macro not found."
 	echo "--- You won't be able to build the language bindings!"
+	echo "--- More info: http://sigrok.org/wiki/Building#FAQ"
 fi
 if [ "x$CXXMACROVERSION" != "x" ] && [ "$CXXMACROVERSION" -lt 4 ]; then
 	echo "--- Warning: AX_CXX_COMPILE_STDCXX_11 macro is too old."
 	echo "--- (found version $CXXMACROVERSION, at least 4 is required)"
 	echo "--- You won't be able to build the language bindings!"
+	echo "--- More info: http://sigrok.org/wiki/Building#FAQ"
 fi
 
 autoheader || exit 1