diff --git a/aclocal.m4 b/aclocal.m4
index 99f945b7..1b50be2a 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -294,3 +294,4 @@ m4_include([m4/gs_gcc_version.m4])
 m4_include([m4/gs_library_combo.m4])
 m4_include([m4/gs_objc_runtime.m4])
 m4_include([m4/gs_runtime_abi.m4])
+m4_include([m4/gs_blocks_support.m4])
diff --git a/config.make.in b/config.make.in
index 2763fad6..d011c3ae 100644
--- a/config.make.in
+++ b/config.make.in
@@ -67,6 +67,7 @@ CLANG_CC = @CLANG_CC@
 OPTFLAG  = @CFLAGS@
 OBJCFLAGS= @OBJCFLAGS@
 OBJC_LIB_FLAG = @OBJC_LIB_FLAG@
+BLOCKS_LIB_FLAG = @BLOCKS_LIBS@
 CPPFLAGS = @CPPFLAGS@
 CPP      = @CPP@
 CCFLAGS  = @CXXFLAGS@
diff --git a/configure b/configure
old mode 100755
new mode 100644
index 47be0b47..3150225d
--- a/configure
+++ b/configure
@@ -645,6 +645,7 @@ OBJ_MERGE_CMD_FLAG
 USE_ARC
 ac_cv_objc_threaded
 objc_threaded
+BLOCKS_LIBS
 libobjc_LIBS
 libobjc_CFLAGS
 PKG_CONFIG_LIBDIR
@@ -5824,53 +5825,7 @@ fi
 
 
 else
-  if test "$OBJC_RUNTIME_LIB" = ng; then
-    #
-    # Detect compiler support for Blocks; perhaps someday -fblocks won't be
-    # required, in which case we'll need to change this.
-    #
-    saveCFLAGS="$CFLAGS"
-    CFLAGS="$CFLAGS -fblocks"
-    ac_ext=c
-ac_cpp='$CPP $CPPFLAGS'
-ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
-ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
-ac_compiler_gnu=$ac_cv_c_compiler_gnu
-
-
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-int
-main (void)
-{
-(void)^{int i; i = 0; }();
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_c_try_compile "$LINENO"
-then :
-
-      ac_cv_blocks="yes"
-
-else $as_nop
-
-      ac_cv_blocks="no"
 
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
-    CFLAGS="$saveCFLAGS"
-    ac_ext=c
-ac_cpp='$CPP $CPPFLAGS'
-ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
-ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
-ac_compiler_gnu=$ac_cv_c_compiler_gnu
-
-    if test "$ac_cv_blocks" = no; then
-      as_fn_error $? "Your compiler doesn't appear to support blocks. To fix this use the CC environment varibale to specify a different compiler (or use a different library-combo)" "$LINENO" 5;
-    fi
-  fi
   # Extract the first word of "ar", so it can be a program name with args.
 set dummy ar; ac_word=$2
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
@@ -8152,7 +8107,7 @@ printf "%s\n" "$gs_cv_libobjc_domain_ng" >&6; }
 
         if test ! x"$libobjc_LIBS" = x""; then
         OBJC_CPPFLAGS=$libobjc_CFLAGS
-        OBCJ_LDFLAGS=""
+        OBJC_LDFLAGS=""
         OBJC_FINAL_LIB_FLAG=$libobjc_LIBS
         elif test ! x"$gs_cv_libobjc_domain_ng" = x""; then
         if test x"$gs_cv_libobjc_domain_ng" = x"SYSTEM"; then
@@ -8219,7 +8174,8 @@ printf "%s\n" "$gs_cv_libobjc_domain_ng" >&6; }
 
 
 
-      ac_fn_c_check_func "$LINENO" "objc_test_capability" "ac_cv_func_objc_test_capability"
+
+ac_fn_c_check_func "$LINENO" "objc_test_capability" "ac_cv_func_objc_test_capability"
 if test "x$ac_cv_func_objc_test_capability" = xyes
 then :
 
@@ -8666,7 +8622,7 @@ printf "%s\n" "$gs_cv_libobjc_domain_dflt" >&6; }
 
         if test ! x"$libobjc_LIBS" = x""; then
         OBJC_CPPFLAGS=$libobjc_CFLAGS
-        OBCJ_LDFLAGS=""
+        OBJC_LDFLAGS=""
         OBJC_FINAL_LIB_FLAG=$libobjc_LIBS
         elif test ! x"$gs_cv_libobjc_domain_dflt" = x""; then
         if test x"$gs_cv_libobjc_domain_dflt" = x"SYSTEM"; then
@@ -8730,6 +8686,122 @@ printf "%s\n" "$gs_cv_libobjc_domain_dflt" >&6; }
 
 
 
+
+
+    BLOCKS_LIBS=""
+    if test "$OBJC_RUNTIME_LIB" = ng; then
+    #
+    # Detect compiler support for Blocks; perhaps someday -fblocks won't be
+    # required, in which case we'll need to change this.
+    #
+    saveCFLAGS="$CFLAGS"
+    CFLAGS="$CFLAGS -fblocks"
+
+    ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for blocks support in compiler" >&5
+printf %s "checking for blocks support in compiler... " >&6; }
+    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main (void)
+{
+(void)^{int i; i = 0; }();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"
+then :
+
+      ac_cv_blocks="yes"
+
+else $as_nop
+
+      ac_cv_blocks="no"
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
+    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_blocks" >&5
+printf "%s\n" "$ac_cv_blocks" >&6; }
+    CFLAGS="$saveCFLAGS"
+    if test "$ac_cv_blocks" = yes; then
+      saveLIBS="$LIBS"
+      LIBS="$LIBS $OBJC_FINAL_LIB_FLAG"
+      ac_fn_c_check_func "$LINENO" "_Block_copy" "ac_cv_func__Block_copy"
+if test "x$ac_cv_func__Block_copy" = xyes
+then :
+
+fi
+
+      LIBS="$saveLIBS"
+      if test "$ac_cv_func__Block_copy" = no; then
+        { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for _Block_copy in -lBlocksRuntime" >&5
+printf %s "checking for _Block_copy in -lBlocksRuntime... " >&6; }
+if test ${ac_cv_lib_BlocksRuntime__Block_copy+y}
+then :
+  printf %s "(cached) " >&6
+else $as_nop
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lBlocksRuntime  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+char _Block_copy ();
+int
+main (void)
+{
+return _Block_copy ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"
+then :
+  ac_cv_lib_BlocksRuntime__Block_copy=yes
+else $as_nop
+  ac_cv_lib_BlocksRuntime__Block_copy=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_BlocksRuntime__Block_copy" >&5
+printf "%s\n" "$ac_cv_lib_BlocksRuntime__Block_copy" >&6; }
+if test "x$ac_cv_lib_BlocksRuntime__Block_copy" = xyes
+then :
+  printf "%s\n" "#define HAVE_LIBBLOCKSRUNTIME 1" >>confdefs.h
+
+  LIBS="-lBlocksRuntime $LIBS"
+
+fi
+
+        if test "$ac_cv_lib_BlocksRuntime__Block_copy" = yes; then
+          BLOCKS_LIBS="-lBlocksRuntime"
+        else
+          as_fn_error $? "Your compiler supports blocks, but the symbols required for blocks support are found neither in libobjc nor in libBlocksRuntime. To fix this, recompile libobjc2 with an embedded blocks runtime, or install libBlocksRuntime/libdispatch with private headers." "$LINENO" 5
+        fi
+      fi
+    else
+      as_fn_error $? "Your compiler doesn't appear to support blocks. To fix this use the CC environment varibale to specify a different compiler (or use a different library-combo)" "$LINENO" 5;
+    fi
+    ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+  fi
+
+
 #--------------------------------------------------------------------
 # Check if libobjc was compiled with thread support.
 #--------------------------------------------------------------------
diff --git a/configure.ac b/configure.ac
index 65406b07..5e0eafe4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -228,25 +228,7 @@ if test "x$target" != "x$host"; then
   AC_CHECK_PROG(DLLTOOL, "${targetArgument}-dlltool", dnl
                          "${targetArgument}-dlltool", dlltool)
 else
-  if test "$OBJC_RUNTIME_LIB" = ng; then
-    #
-    # Detect compiler support for Blocks; perhaps someday -fblocks won't be
-    # required, in which case we'll need to change this.
-    #
-    saveCFLAGS="$CFLAGS"
-    CFLAGS="$CFLAGS -fblocks"
-    AC_LANG_PUSH(C)
-    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[(void)^{int i; i = 0; }();])], [
-      ac_cv_blocks="yes"
-    ], [
-      ac_cv_blocks="no"
-    ])
-    CFLAGS="$saveCFLAGS"
-    AC_LANG_POP(C)
-    if test "$ac_cv_blocks" = no; then
-      AC_MSG_ERROR([Your compiler doesn't appear to support blocks. To fix this use the CC environment varibale to specify a different compiler (or use a different library-combo)]);
-    fi
-  fi
+
   AC_CHECK_PROG(AR,      ar,      ar)
   AC_CHECK_PROG(DLLTOOL, dlltool, dlltool)
   AC_PROG_RANLIB
@@ -1147,7 +1129,7 @@ fi
 
 
 GS_CHECK_OBJC_RUNTIME()
-
+GS_BLOCKS_SUPPORT()
 #--------------------------------------------------------------------
 # Check if libobjc was compiled with thread support.
 #--------------------------------------------------------------------
diff --git a/library-combo.make b/library-combo.make
index 16f531c6..fc641571 100644
--- a/library-combo.make
+++ b/library-combo.make
@@ -42,7 +42,7 @@ endif
 ifeq ($(OBJC_RUNTIME_LIB), ng)
   OBJC_LDFLAGS =
   OBJC_LIB_DIR =
-  OBJC_LIBS = $(OBJC_LIB_FLAG)
+  OBJC_LIBS = $(OBJC_LIB_FLAG) $(BLOCKS_LIB_FLAG)
   ifeq ($(RUNTIME_VERSION),)
     ifneq ($(DEFAULT_OBJC_RUNTIME_ABI),)
       RUNTIME_VERSION=$(DEFAULT_OBJC_RUNTIME_ABI)
diff --git a/m4/gs_blocks_support.m4 b/m4/gs_blocks_support.m4
new file mode 100644
index 00000000..8c7041ca
--- /dev/null
+++ b/m4/gs_blocks_support.m4
@@ -0,0 +1,50 @@
+# SYNOPSIS
+#
+#   GS_BLOCKS_SUPPORT()
+#
+# DESCRIPTION
+#
+# This macro determines whether and how blocks are used
+#
+AC_DEFUN([GS_BLOCKS_SUPPORT],dnl
+  [
+    AC_REQUIRE([GS_LIBRARY_COMBO])
+    AC_REQUIRE([GS_CHECK_OBJC_RUNTIME])
+    BLOCKS_LIBS=""
+    if test "$OBJC_RUNTIME_LIB" = ng; then
+    #
+    # Detect compiler support for Blocks; perhaps someday -fblocks won't be
+    # required, in which case we'll need to change this.
+    #
+    saveCFLAGS="$CFLAGS"
+    CFLAGS="$CFLAGS -fblocks"
+
+    AC_LANG_PUSH(C)
+    AC_MSG_CHECKING([for blocks support in compiler])
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[(void)^{int i; i = 0; }();])], [
+      ac_cv_blocks="yes"
+    ], [
+      ac_cv_blocks="no"
+    ])
+    AC_MSG_RESULT([$ac_cv_blocks])
+    CFLAGS="$saveCFLAGS"
+    if test "$ac_cv_blocks" = yes; then
+      saveLIBS="$LIBS"
+      LIBS="$LIBS $OBJC_FINAL_LIB_FLAG"
+      AC_CHECK_FUNC([_Block_copy])
+      LIBS="$saveLIBS"
+      if test "$ac_cv_func__Block_copy" = no; then
+        AC_CHECK_LIB([BlocksRuntime], [_Block_copy])
+        if test "$ac_cv_lib_BlocksRuntime__Block_copy" = yes; then
+          BLOCKS_LIBS="-lBlocksRuntime"
+        else
+          AC_MSG_ERROR([Your compiler supports blocks, but the symbols required for blocks support are found neither in libobjc nor in libBlocksRuntime. To fix this, recompile libobjc2 with an embedded blocks runtime, or install libBlocksRuntime/libdispatch with private headers.])
+        fi
+      fi
+    else
+      AC_MSG_ERROR([Your compiler doesn't appear to support blocks. To fix this use the CC environment varibale to specify a different compiler (or use a different library-combo)]);
+    fi
+    AC_LANG_POP(C)
+  fi
+  AC_SUBST(BLOCKS_LIBS)
+])
diff --git a/m4/gs_objc_runtime.m4 b/m4/gs_objc_runtime.m4
index 369fc991..0fbed1fb 100644
--- a/m4/gs_objc_runtime.m4
+++ b/m4/gs_objc_runtime.m4
@@ -164,7 +164,7 @@ AC_DEFUN([GS_OBJC_LIB_FLAG], [
 # Configure the installed Objective-C runtime, if it is installed. This sets up CFLAGS/LDFLAGS/LD_LIBRARY_PATH 
 # as required. Additionally, following variables are set after execution of this macro:
 # * OBJC_CPPFLAGS
-# * OBCJ_LDFLAGS
+# * OBJC_LDFLAGS
 # * OBJC_FINAL_LIB_FLAG
 # * OBJCRT
 #
@@ -185,7 +185,7 @@ AC_DEFUN([GS_CHECK_OBJC_RUNTIME], [
     dnl pkg-config makes it easy for us to configure the flags
     if test ! x"$libobjc_LIBS" = x""; then
         OBJC_CPPFLAGS=$libobjc_CFLAGS
-        OBCJ_LDFLAGS=""
+        OBJC_LDFLAGS=""
         OBJC_FINAL_LIB_FLAG=$libobjc_LIBS
     dnl we need to invest more smarts if
     elif test ! x"$gs_cv_libobjc_domain" = x""; then
@@ -279,4 +279,4 @@ AC_DEFUN([GS_CHECK_RUNTIME_ABI20_SUPPORT], [
             fi
     ])
     AS_VAR_SET([libobjc_SUPPORTS_ABI20], [${gs_cv_libobjc_abi_20}])
-])
\ No newline at end of file
+])