diff --git a/os/common/startup/ARM/compilers/GCC/rules.mk b/os/common/startup/ARM/compilers/GCC/rules.mk
index 85cdbf31a..921404c18 100644
--- a/os/common/startup/ARM/compilers/GCC/rules.mk
+++ b/os/common/startup/ARM/compilers/GCC/rules.mk
@@ -120,8 +120,8 @@ ASMXOBJS  = $(addprefix $(OBJDIR)/, $(notdir $(ASMXSRC:.S=.o)))
 OBJS      = $(ASMXOBJS) $(ASMOBJS) $(ACOBJS) $(TCOBJS) $(ACPPOBJS) $(ACCOBJS) $(TCPPOBJS) $(TCOBJS)
 
 # Paths
-IINCDIR   = $(patsubst %,-I%,$(INCDIR) $(DINCDIR) $(UINCDIR))
-LLIBDIR   = $(patsubst %,-L%,$(DLIBDIR) $(ULIBDIR))
+IINCDIR   = $(sort $(patsubst %,-I%,$(INCDIR) $(DINCDIR) $(UINCDIR)))
+LLIBDIR   = $(sort $(patsubst %,-L%,$(DLIBDIR) $(ULIBDIR)))
 
 # Macros
 DEFS      = $(DDEFS) $(UDEFS)
diff --git a/os/common/startup/ARMCMx/compilers/GCC/mk/rules.mk b/os/common/startup/ARMCMx/compilers/GCC/mk/rules.mk
index a7de8cf1d..61c62e285 100644
--- a/os/common/startup/ARMCMx/compilers/GCC/mk/rules.mk
+++ b/os/common/startup/ARMCMx/compilers/GCC/mk/rules.mk
@@ -106,8 +106,8 @@ ASMXOBJS  := $(addprefix $(OBJDIR)/, $(notdir $(ASMXSRC:.S=.o)))
 OBJS      := $(ASMXOBJS) $(ASMOBJS) $(ACOBJS) $(TCOBJS) $(ACPPOBJS) $(TCPPOBJS) $(TCCOBJS)
 
 # Paths
-IINCDIR   := $(patsubst %,-I%,$(INCDIR) $(DINCDIR) $(UINCDIR))
-LLIBDIR   := $(patsubst %,-L%,$(DLIBDIR) $(ULIBDIR))
+IINCDIR   := $(sort $(patsubst %,-I%,$(INCDIR) $(DINCDIR) $(UINCDIR)))
+LLIBDIR   := $(sort $(patsubst %,-L%,$(DLIBDIR) $(ULIBDIR)))
 
 # Macros
 DEFS      := $(DDEFS) $(UDEFS)
diff --git a/os/common/startup/SIMIA32/compilers/GCC/rules.mk b/os/common/startup/SIMIA32/compilers/GCC/rules.mk
index 3d06b5ce1..86d1beb03 100644
--- a/os/common/startup/SIMIA32/compilers/GCC/rules.mk
+++ b/os/common/startup/SIMIA32/compilers/GCC/rules.mk
@@ -64,8 +64,8 @@ ASMXOBJS  = $(addprefix $(OBJDIR)/, $(notdir $(ASMXSRC:.S=.o)))
 OBJS      = $(ASMXOBJS) $(ASMOBJS) $(COBJS) $(CPPOBJS) $(CCOBJS)
 
 # Paths
-IINCDIR   = $(patsubst %,-I%,$(INCDIR) $(DINCDIR) $(UINCDIR))
-LLIBDIR   = $(patsubst %,-L%,$(DLIBDIR) $(ULIBDIR))
+IINCDIR   = $(sort $(patsubst %,-I%,$(INCDIR) $(DINCDIR) $(UINCDIR)))
+LLIBDIR   = $(sort $(patsubst %,-L%,$(DLIBDIR) $(ULIBDIR)))
 
 # Macros
 DEFS      = $(DDEFS) $(UDEFS)
diff --git a/os/common/startup/e200/compilers/GCC/rules.mk b/os/common/startup/e200/compilers/GCC/rules.mk
index 829ec07cc..e4a7a7161 100644
--- a/os/common/startup/e200/compilers/GCC/rules.mk
+++ b/os/common/startup/e200/compilers/GCC/rules.mk
@@ -87,8 +87,8 @@ ASMXOBJS  = $(addprefix $(OBJDIR)/, $(notdir $(ASMXSRC:.S=.o)))
 OBJS      = $(ASMXOBJS) $(ASMOBJS) $(COBJS) $(CPPOBJS)
 
 # Paths
-IINCDIR   = $(patsubst %,-I%,$(INCDIR) $(DINCDIR) $(UINCDIR))
-LLIBDIR   = $(patsubst %,-L%,$(DLIBDIR) $(ULIBDIR))
+IINCDIR   = $(sort $(patsubst %,-I%,$(INCDIR) $(DINCDIR) $(UINCDIR)))
+LLIBDIR   = $(sort $(patsubst %,-L%,$(DLIBDIR) $(ULIBDIR)))
 
 # Macros
 DEFS      = $(DDEFS) $(UDEFS)
diff --git a/readme.txt b/readme.txt
index 1c4815e46..7e9afbd51 100644
--- a/readme.txt
+++ b/readme.txt
@@ -74,6 +74,7 @@
 *****************************************************************************
 
 *** Next ***
+- NEW: Automatic removal of duplicated inclusion paths on make command lines.
 - NEW: Reworked STM32 SDMMCv1 and SDMMCv2 drivers, better timeout and clock
        handling, improved speed for aligned buffers.
 - NEW: Added a "waend" field to the thread structure in RT for debug