diff --git a/Examples/Makefile.preamble b/Examples/Makefile.preamble
index 03efab610..599f0118c 100644
--- a/Examples/Makefile.preamble
+++ b/Examples/Makefile.preamble
@@ -19,7 +19,8 @@
 #
 #  You should have received a copy of the GNU General Public
 #  License along with this library; if not, write to the Free
-#  Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111 USA.
+#  Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+#  Boston, MA 02111 USA.
 #
 
 #
@@ -36,13 +37,13 @@
 #
 
 # Additional flags to pass to the preprocessor
-ADDITIONAL_CPPFLAGS = 
+ADDITIONAL_CPPFLAGS = -Wdeclaration-after-statement
 
 # Additional flags to pass to the Objective-C compiler
-ADDITIONAL_OBJCFLAGS = 
+ADDITIONAL_OBJCFLAGS =
 
 # Additional flags to pass to the C compiler
-ADDITIONAL_CFLAGS = 
+ADDITIONAL_CFLAGS =
 
 # Additional include directories the compiler should search
 ifeq ($(FOUNDATION_LIB),gnu)
diff --git a/SSL/Makefile.preamble b/SSL/Makefile.preamble
index edf4a60f2..378cf7ba8 100644
--- a/SSL/Makefile.preamble
+++ b/SSL/Makefile.preamble
@@ -39,7 +39,9 @@
 #
 
 # Additional flags to pass to the preprocessor
-ADDITIONAL_CPPFLAGS = $(DEFS) $(CONFIG_SYSTEM_DEFS) -Wall
+ADDITIONAL_CPPFLAGS = $(DEFS) $(CONFIG_SYSTEM_DEFS) \
+-Wall \
+-Wdeclaration-after-statement
 
 # Additional flags to pass to the Objective-C compiler
 ADDITIONAL_OBJCFLAGS = $(SSLFLAGS)
diff --git a/Source/Additions/Makefile.preamble b/Source/Additions/Makefile.preamble
index 34e80cb0c..daa6b7f50 100644
--- a/Source/Additions/Makefile.preamble
+++ b/Source/Additions/Makefile.preamble
@@ -39,7 +39,10 @@
 #
 
 # Additional flags to pass to the preprocessor
-ADDITIONAL_CPPFLAGS = $(DEFS) $(CONFIG_SYSTEM_DEFS) -Wall -DNO_GNUSTEP=1
+ADDITIONAL_CPPFLAGS = $(DEFS) $(CONFIG_SYSTEM_DEFS) \
+-Wall \
+-Wdeclaration-after-statement \
+-DNO_GNUSTEP=1
 
 # Additional flags to pass to the Objective-C compiler
 #ADDITIONAL_OBJCFLAGS = 
diff --git a/Source/Makefile.preamble b/Source/Makefile.preamble
index 3f6b0b814..52cff99d6 100644
--- a/Source/Makefile.preamble
+++ b/Source/Makefile.preamble
@@ -41,6 +41,7 @@
 # Additional flags to pass to the preprocessor
 ADDITIONAL_CPPFLAGS = $(DEFS) $(CONFIG_SYSTEM_DEFS) -Wall \
 -Wcast-align \
+-Wdeclaration-after-statement \
 #-Wstrict-prototypes \
 #-Wpointer-arith \
 #-Wcast-qual \
diff --git a/Source/ObjectiveC2/Makefile.preamble b/Source/ObjectiveC2/Makefile.preamble
index 319838aff..c24c15d1e 100644
--- a/Source/ObjectiveC2/Makefile.preamble
+++ b/Source/ObjectiveC2/Makefile.preamble
@@ -39,7 +39,9 @@
 #
 
 # Additional flags to pass to the preprocessor
-ADDITIONAL_CPPFLAGS = $(DEFS) $(CONFIG_SYSTEM_DEFS) -Wall
+ADDITIONAL_CPPFLAGS = $(DEFS) $(CONFIG_SYSTEM_DEFS) \
+-Wall \
+-Wdeclaration-after-statement
 
 # Additional flags to pass to the Objective-C compiler
 #ADDITIONAL_OBJCFLAGS = 
diff --git a/Source/unix/Makefile.preamble b/Source/unix/Makefile.preamble
index 5309f0e31..737818c80 100644
--- a/Source/unix/Makefile.preamble
+++ b/Source/unix/Makefile.preamble
@@ -39,7 +39,9 @@
 #
 
 # Additional flags to pass to the preprocessor
-ADDITIONAL_CPPFLAGS = $(DEFS) $(CONFIG_SYSTEM_DEFS) -Wall
+ADDITIONAL_CPPFLAGS = $(DEFS) $(CONFIG_SYSTEM_DEFS) \
+-Wall \
+-Wdeclaration-after-statement
 
 # Additional flags to pass to the Objective-C compiler
 #ADDITIONAL_OBJCFLAGS = 
diff --git a/Source/win32/Makefile.preamble b/Source/win32/Makefile.preamble
index 5309f0e31..737818c80 100644
--- a/Source/win32/Makefile.preamble
+++ b/Source/win32/Makefile.preamble
@@ -39,7 +39,9 @@
 #
 
 # Additional flags to pass to the preprocessor
-ADDITIONAL_CPPFLAGS = $(DEFS) $(CONFIG_SYSTEM_DEFS) -Wall
+ADDITIONAL_CPPFLAGS = $(DEFS) $(CONFIG_SYSTEM_DEFS) \
+-Wall \
+-Wdeclaration-after-statement
 
 # Additional flags to pass to the Objective-C compiler
 #ADDITIONAL_OBJCFLAGS = 
diff --git a/Tools/Makefile.preamble b/Tools/Makefile.preamble
index e9c569791..48522eb55 100644
--- a/Tools/Makefile.preamble
+++ b/Tools/Makefile.preamble
@@ -37,10 +37,12 @@
 #
 
 # Additional flags to pass to the preprocessor
-# ADDITIONAL_CPPFLAGS +=
+ADDITIONAL_CPPFLAGS += \
+-Wall \
+-Wdeclaration-after-statement
 
 # Additional flags to pass to the Objective-C compiler
-ADDITIONAL_OBJCFLAGS += -Wall
+#ADDITIONAL_OBJCFLAGS +=
 
 # Additional flags to pass to the C compiler
 #ADDITIONAL_CFLAGS += 
diff --git a/Tools/make_strings/GNUmakefile.preamble b/Tools/make_strings/GNUmakefile.preamble
index 8e01ed0c8..5a39676ee 100644
--- a/Tools/make_strings/GNUmakefile.preamble
+++ b/Tools/make_strings/GNUmakefile.preamble
@@ -40,7 +40,7 @@
 ADDITIONAL_CPPFLAGS += 
 
 # Additional flags to pass to the Objective-C compiler
-ADDITIONAL_OBJCFLAGS += -Wall
+ADDITIONAL_OBJCFLAGS += -Wall -Wdeclaration-after-statement
 
 # Additional flags to pass to the C compiler
 #ADDITIONAL_CFLAGS +=