diff --git a/.gitignore b/.gitignore
index a5ab809ad..378e5117c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,6 @@
 __pycache__
 build/*
 *.o
-*.ts
 *.d
 *.a
 *.bin
diff --git a/README b/README
index 442dbfa58..183d61149 100644
--- a/README
+++ b/README
@@ -17,17 +17,15 @@ production version of Milkymist SoC, visit:
 [> Instructions (software)
 --------------------------
 1. Compile and install binutils. Take the latest version from GNU.
-  ./configure --target=lm32-elf
+  mkdir build && cd build
+  ../configure --target=lm32-elf
   make
   make install
   
-2. Compile and install LLVM and Clang.
-  git clone git://github.com/milkymist/llvm-lm32.git
-  cd llvm-lm32/tools
-  git clone git://github.com/milkymist/clang-lm32.git clang
-  cd ..
-  mkdir build
-  cmake ..
+2. Compile and install GCC 4.5. Take gcc-core and gcc-g++ from GNU.
+  rm -rf libstdc++-v3
+  mkdir build && cd build
+  ../configure --target=lm32-elf --enable-languages="c,c++" --disable-libgcc --disable-libssp
   make
   make install
 
@@ -42,8 +40,7 @@ production version of Milkymist SoC, visit:
   make flash
 
 The second command requires m1nor, FJMEM and UrJTAG.
-These tools can be found respectively at:
-  http://projects.qi-hardware.com/index.php/p/wernermisc/
+These tools can be found at:
   https://github.com/milkymist/fjmem-m1
   http://urjtag.org
   
@@ -84,7 +81,7 @@ The authors grant the additional permissions that the code can be used in
 conjunction with the LatticeMico32 CPU core from Lattice.
 
 Unless otherwise noted, Milkymist-NG's source code is copyright (C)
-2011-2012 Sebastien Bourdeauducq. Other authors retain ownership of their
+2011-2013 Sebastien Bourdeauducq. Other authors retain ownership of their
 contributions. If a submission can reasonably be considered independently
 copyrightable, it's yours and I encourage you to claim it with
 appropriate copyright notices. This submission then falls under the
diff --git a/software/common.mak b/software/common.mak
index 76ea448ab..47bb54eaf 100644
--- a/software/common.mak
+++ b/software/common.mak
@@ -1,19 +1,18 @@
-TARGET_PREFIX=lm32-elf
-CLANG=clang -target lm32
+TARGET_PREFIX=lm32-elf-
 
-CC_normal := $(CLANG)
-AS_normal := $(TARGET_PREFIX)-as
-AR_normal := $(TARGET_PREFIX)-ar
-LD_normal := $(TARGET_PREFIX)-ld
-OBJCOPY_normal := $(TARGET_PREFIX)-objcopy
-RANLIB_normal := $(TARGET_PREFIX)-ranlib
+CC_normal := $(TARGET_PREFIX)gcc
+AS_normal := $(TARGET_PREFIX)as
+AR_normal := $(TARGET_PREFIX)ar
+LD_normal := $(TARGET_PREFIX)ld
+OBJCOPY_normal := $(TARGET_PREFIX)objcopy
+RANLIB_normal := $(TARGET_PREFIX)ranlib
 
-CC_quiet = @echo " CC " $@ && $(CLANG)
-AS_quiet = @echo " AS " $@ && $(TARGET_PREFIX)-as
-AR_quiet = @echo " AR " $@ && $(TARGET_PREFIX)-ar
-LD_quiet = @echo " LD " $@ && $(TARGET_PREFIX)-ld
-OBJCOPY_quiet = @echo " OBJCOPY " $@ && $(TARGET_PREFIX)-objcopy
-RANLIB_quiet = @echo " RANLIB  " $@ && $(TARGET_PREFIX)-ranlib
+CC_quiet = @echo " CC " $@ && $(TARGET_PREFIX)gcc
+AS_quiet = @echo " AS " $@ && $(TARGET_PREFIX)as
+AR_quiet = @echo " AR " $@ && $(TARGET_PREFIX)ar
+LD_quiet = @echo " LD " $@ && $(TARGET_PREFIX)ld
+OBJCOPY_quiet = @echo " OBJCOPY " $@ && $(TARGET_PREFIX)objcopy
+RANLIB_quiet = @echo " RANLIB  " $@ && $(TARGET_PREFIX)ranlib
 
 ifeq ($(V),1)
 	CC = $(CC_normal)
@@ -34,22 +33,22 @@ endif
 # Toolchain options
 #
 INCLUDES = -I$(M2DIR)/software/include/base -I$(M2DIR)/software/include -I$(M2DIR)/common
-CFLAGS = -O3 -Wall -Wstrict-prototypes -Wold-style-definition -Wshadow \
-	 -Wmissing-prototypes -nostdinc $(INCLUDES)
+CFLAGS = -O3 -mbarrel-shift-enabled -mmultiply-enabled -mdivide-enabled -msign-extend-enabled \
+	-Wall -Wstrict-prototypes -Wold-style-definition -Wshadow \
+	-Wmissing-prototypes -fno-builtin -nostdinc $(INCLUDES)
 LDFLAGS = -nostdlib -nodefaultlibs
 
 # compile and generate dependencies, based on
 # http://scottmcpeak.com/autodepend/autodepend.html
 
 define compile-dep
-$(CC) -c $(CFLAGS) $< -o $*.ts -S
+$(CC) -c $(CFLAGS) $< -o $*.o
 @$(CC_normal) -MM $(CFLAGS) $< > $*.d
 @mv -f $*.d $*.d.tmp
 @sed -e 's|.*:|$*.o:|' < $*.d.tmp > $*.d
 @sed -e 's/.*://' -e 's/\\$$//' < $*.d.tmp | fmt -1 | \
 	sed -e 's/^ *//' -e 's/$$/:/' >> $*.d
 @rm -f $*.d.tmp
-@$(AS_normal) -o $*.o $*.ts
 endef
 
 define assemble
diff --git a/software/libcompiler-rt/Makefile b/software/libcompiler-rt/Makefile
index 15274808d..906149fbd 100644
--- a/software/libcompiler-rt/Makefile
+++ b/software/libcompiler-rt/Makefile
@@ -4,7 +4,7 @@ include $(M2DIR)/software/common.mak
 CFLAGS+=-D_YUGA_LITTLE_ENDIAN=0 -D_YUGA_BIG_ENDIAN=1 -Wno-missing-prototypes
 
 OBJECTS=divsi3.o modsi3.o comparedf2.o negsf2.o negdf2.o addsf3.o subsf3.o mulsf3.o divsf3.o lshrdi3.o muldi3.o divdi3.o ashldi3.o ashrdi3.o udivmoddi4.o \
-  floatsisf.o floatunsisf.o fixsfsi.o fixunssfsi.o adddf3.o subdf3.o muldf3.o divdf3.o floatsidf.o floatunsidf.o floatdidf.o fixdfsi.o fixunsdfsi.o
+  floatsisf.o floatunsisf.o fixsfsi.o fixunssfsi.o adddf3.o subdf3.o muldf3.o divdf3.o floatsidf.o floatunsidf.o floatdidf.o fixdfsi.o fixunsdfsi.o clzsi2.o
 
 all: libcompiler-rt.a