Bug 380540: Check curl-config if libcurl.pc isn't found, try enabling breakpad by default again on linux. r=luser

configure.in

@@ -5334,7 +5334,8 @@ dnl = Airbag crash reporting (on by default on supported platforms)
 dnl ========================================================
 
 if test "$OS_ARCH" = "WINNT" -a -z "$GNU_CC" \
-  || test "$OS_ARCH" = "Darwin"; then
+  || test "$OS_ARCH" = "Darwin" \
+  || test "$OS_ARCH" = "Linux"; then
    MOZ_AIRBAG=1
 fi
 
@@ -5347,7 +5348,25 @@ if test -n "$MOZ_AIRBAG"; then
    AC_DEFINE(MOZ_AIRBAG)
 
   if test "$OS_ARCH" = "Linux"; then
-    PKG_CHECK_MODULES(MOZ_LIBCURL, libcurl)
+    PKG_CHECK_MODULES(MOZ_LIBCURL, libcurl, _CURL_FOUND=1, _CURL_FOUND=)
+    if test -z "$_CURL_FOUND"; then
+       AC_PATH_PROGS(CURL_CONFIG, $CURL_CONFIG curl-config)
+       if test -n "$CURL_CONFIG"; then
+          AC_MSG_CHECKING(MOZ_LIBCURL_CFLAGS)
+          MOZ_LIBCURL_CFLAGS=`${CURL_CONFIG} --cflags`
+          AC_MSG_RESULT($MOZ_LIBCURL_CFLAGS)
+
+          AC_MSG_CHECKING(MOZ_LIBCURL_LIBS)
+          MOZ_LIBCURL_LIBS=`${CURL_CONFIG} --libs`
+          AC_MSG_RESULT($MOZ_LIBCURL_LIBS)
+
+          _CURL_FOUND=1
+       fi
+    fi
+
+    if test -z "$_CURL_FOUND"; then
+        AC_MSG_ERROR([Couldn't find libcurl, which is required for the crash reporter.  Use --disable-airbag to disable the crash reporter.])
+    fi
   fi
 fi