diff --git a/.gitmodules b/.gitmodules
index 459d383..f69523f 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -19,3 +19,6 @@
 [submodule "sysa/mescc-tools-patched"]
 	path = sysa/mescc-tools-patched
 	url = https://github.com/oriansj/mescc-tools
+[submodule "sysa/tcc-0.9.27"]
+	path = sysa/tcc-0.9.27
+	url = git://repo.or.cz/tinycc.git
diff --git a/rootfs.sh b/rootfs.sh
index 7f180d9..9f4abf8 100755
--- a/rootfs.sh
+++ b/rootfs.sh
@@ -36,7 +36,6 @@ ln -s . tmp/after/lib/x86-mes
 ln -s . tmp/after/lib/linux/x86-mes
 mkdir tmp/after/include/{mes,gnu,linux,sys,mach}
 mkdir tmp/after/include/linux/{x86,x86_64}
-# put all the kaems for after in
 cp after.kaem tmp/
 cp after.kaem.run tmp/after/kaem.run
 
@@ -61,11 +60,13 @@ cp mes-files/config.h tmp/after/mes/include/mes/
 cp mes-files/config.h tmp/after/tcc-mes/include/mes/
 mkdir tmp/after/mes/{bin,m2}
 
-# tcc 0.9.26
+# tcc
 cp tcc.kaem tmp/after/
 cp -r tcc-0.9.26p1 tmp/after/
+cp -r tcc-0.9.27 tmp/after/
+touch tmp/after/tcc-0.9.27/config.h
+touch tmp/after/tcc-0.9.26p1/config.h
 pushd tmp/after/tcc-0.9.26p1
-cp ../../../tcc-0.9.26p1-files/config.h .
 ln -s ../mes/module .
 ln -s ../mes/mes .
 ln -s /after/lib x86-mes
diff --git a/sysa/tcc-0.9.26p1-files/config.h b/sysa/tcc-0.9.26p1-files/config.h
deleted file mode 100644
index e69de29..0000000
diff --git a/sysa/tcc-0.9.27 b/sysa/tcc-0.9.27
new file mode 160000
index 0000000..d348a9a
--- /dev/null
+++ b/sysa/tcc-0.9.27
@@ -0,0 +1 @@
+Subproject commit d348a9a51d32cece842b7885d27a411436d7887b
diff --git a/sysa/tcc.kaem b/sysa/tcc.kaem
index 5ecbae0..1316f85 100755
--- a/sysa/tcc.kaem
+++ b/sysa/tcc.kaem
@@ -83,7 +83,8 @@ mes-tcc -ar cr ${libdir}/libgetopt.a getopt.o
 
 cd ../tcc-0.9.26p1
 
-# boot0
+# boot0 (ref comments here for all boot*)
+# compile
 mes-tcc \
     -g \
     -v \
@@ -99,7 +100,7 @@ mes-tcc \
     -D CONFIG_TCC_CRTPREFIX=\"/after/lib\" \
     -D CONFIG_TCC_ELFINTERP=\"/mes/loader\" \
     -D CONFIG_TCC_LIBPATHS=\"/after/lib:/after/lib/tcc\" \
-    -D CONFIG_TCC_SYSINCLUDEPATHS=\"/after/lib/include\" \
+    -D CONFIG_TCC_SYSINCLUDEPATHS=\"/after/include\" \
     -D TCC_LIBGCC=\"/after/lib/libc.a\" \
     -D TCC_LIBTCC1=\"libtcc1.a\" \
     -D CONFIG_TCCBOOT=1 \
@@ -111,9 +112,11 @@ mes-tcc \
     -L . \
     -L /after/lib \
     tcc.c
+# Install
 cp boot0-tcc /after/bin/
 chmod 755 /after/bin/boot0-tcc
 cd ../tcc-mes
+# Recompile libc: crt{1,n,i}, libtcc.a, libc.a
 boot0-tcc -c -D HAVE_CONFIG_H=1 -I include -I include/linux/x86 -o ${libdir}/crt1.o lib/linux/x86-mes-gcc/crt1.c
 boot0-tcc -c -D HAVE_CONFIG_H=1 -I include -I include/linux/x86 -o ${libdir}/crtn.o lib/linux/x86-mes-gcc/crtn.c
 boot0-tcc -c -D HAVE_CONFIG_H=1 -I include -I include/linux/x86 -o ${libdir}/crti.o lib/linux/x86-mes-gcc/crti.c
@@ -146,7 +149,7 @@ boot0-tcc \
     -D CONFIG_TCC_CRTPREFIX=\"/after/lib\" \
     -D CONFIG_TCC_ELFINTERP=\"/mes/loader\" \
     -D CONFIG_TCC_LIBPATHS=\"/after/lib:/after/lib/tcc\" \
-    -D CONFIG_TCC_SYSINCLUDEPATHS=\"/after/lib/include\" \
+    -D CONFIG_TCC_SYSINCLUDEPATHS=\"/after/include\" \
     -D TCC_LIBGCC=\"/after/lib/libc.a\" \
     -D TCC_LIBTCC1=\"libtcc1.a\" \
     -D CONFIG_TCCBOOT=1 \
@@ -193,7 +196,7 @@ boot1-tcc \
     -D CONFIG_TCC_CRTPREFIX=\"/after/lib\" \
     -D CONFIG_TCC_ELFINTERP=\"/mes/loader\" \
     -D CONFIG_TCC_LIBPATHS=\"/after/lib:/after/lib/tcc\" \
-    -D CONFIG_TCC_SYSINCLUDEPATHS=\"/after/lib/include\" \
+    -D CONFIG_TCC_SYSINCLUDEPATHS=\"/after/include\" \
     -D TCC_LIBGCC=\"/after/lib/libc.a\" \
     -D TCC_LIBTCC1=\"libtcc1.a\" \
     -D CONFIG_TCCBOOT=1 \
@@ -240,7 +243,7 @@ boot2-tcc \
     -D CONFIG_TCC_CRTPREFIX=\"/after/lib\" \
     -D CONFIG_TCC_ELFINTERP=\"/mes/loader\" \
     -D CONFIG_TCC_LIBPATHS=\"/after/lib:/after/lib/tcc\" \
-    -D CONFIG_TCC_SYSINCLUDEPATHS=\"/after/lib/include\" \
+    -D CONFIG_TCC_SYSINCLUDEPATHS=\"/after/include\" \
     -D TCC_LIBGCC=\"/after/lib/libc.a\" \
     -D TCC_LIBTCC1=\"libtcc1.a\" \
     -D CONFIG_TCCBOOT=1 \
@@ -287,7 +290,7 @@ boot3-tcc \
     -D CONFIG_TCC_CRTPREFIX=\"/after/lib\" \
     -D CONFIG_TCC_ELFINTERP=\"/mes/loader\" \
     -D CONFIG_TCC_LIBPATHS=\"/after/lib:/after/lib/tcc\" \
-    -D CONFIG_TCC_SYSINCLUDEPATHS=\"/after/lib/include\" \
+    -D CONFIG_TCC_SYSINCLUDEPATHS=\"/after/include\" \
     -D TCC_LIBGCC=\"/after/lib/libc.a\" \
     -D TCC_LIBTCC1=\"libtcc1.a\" \
     -D CONFIG_TCCBOOT=1 \
@@ -334,7 +337,7 @@ boot4-tcc \
     -D CONFIG_TCC_CRTPREFIX=\"/after/lib\" \
     -D CONFIG_TCC_ELFINTERP=\"/mes/loader\" \
     -D CONFIG_TCC_LIBPATHS=\"/after/lib:/after/lib/tcc\" \
-    -D CONFIG_TCC_SYSINCLUDEPATHS=\"/after/lib/include\" \
+    -D CONFIG_TCC_SYSINCLUDEPATHS=\"/after/include\" \
     -D TCC_LIBGCC=\"/after/lib/libc.a\" \
     -D TCC_LIBTCC1=\"libtcc1.a\" \
     -D CONFIG_TCCBOOT=1 \
@@ -371,4 +374,51 @@ chmod 755 /after/bin/tcc
 tcc -c -D HAVE_CONFIG_H=1 -I include -I include/linux/x86 lib/posix/getopt.c
 tcc -ar cr ${libdir}/libgetopt.a getopt.o
 
+# Now compile tcc 0.9.27
+cd ../tcc-0.9.27
+
+# Compile the binary
+tcc \
+    -v \
+    -static \
+    -o tcc \
+    -D TCC_TARGET_I386=1 \
+    -D CONFIG_TCCDIR=\"/after/lib/tcc\" \
+    -D CONFIG_TCC_CRTPREFIX=\"/after/lib\" \
+    -D CONFIG_TCC_ELFINTERP=\"/mes/loader\" \
+    -D CONFIG_TCC_LIBPATHS=\"/after/lib:/after/lib/tcc\" \
+    -D CONFIG_TCC_SYSINCLUDEPATHS=\"/after/include\" \
+    -D TCC_LIBGCC=\"/after/lib/libc.a\" \
+    -D CONFIG_TCC_STATIC=1 \
+    -D CONFIG_USE_LIBGCC=1 \
+    -D TCC_VERSION=\"0.9.27\" \
+    -D ONE_SOURCE=1 \
+    tcc.c
+
+# Install the binary
+cp tcc /after/bin/tcc
+chmod 755 /after/bin/tcc
+
+# Test
+tcc -version
+
+# Recompile libc
+cd ../tcc-mes
+# crt{1,n,i}.o
+tcc -c -D HAVE_CONFIG_H=1 -I include -I include/linux/x86 -o ${libdir}/crt1.o lib/linux/x86-mes-gcc/crt1.c
+tcc -c -D HAVE_CONFIG_H=1 -I include -I include/linux/x86 -o ${libdir}/crtn.o lib/linux/x86-mes-gcc/crtn.c
+tcc -c -D HAVE_CONFIG_H=1 -I include -I include/linux/x86 -o ${libdir}/crti.o lib/linux/x86-mes-gcc/crti.c
+# libtcc1.a
+tcc -c -D HAVE_CONFIG_H=1 -D HAVE_FLOAT=1 -D HAVE_LONG_LONG=1 -I include -I include/linux/x86 lib/libtcc1.c
+tcc -ar cr ${libdir}/tcc/libtcc1.a libtcc1.o
+# libc.a
+tcc -c -D HAVE_CONFIG_H=1 -I include -I include/linux/x86 -o unified-libc-1.o unified-libc-1.c
+tcc -c -D HAVE_CONFIG_H=1 -I include -I include/linux/x86 -o unified-libc-2.o unified-libc-2.c
+tcc -c -D HAVE_CONFIG_H=1 -I include -I include/linux/x86 -o unified-libc-3.o unified-libc-3.c
+tcc -ar cr ${libdir}/libc+gnu.a unified-libc-1.o unified-libc-2.o unified-libc-3.o
+cp ${libdir}/libc+gnu.a ${libdir}/libc.a
+# libgetopt.a
+tcc -c -D HAVE_CONFIG_H=1 -I include -I include/linux/x86 lib/posix/getopt.c
+tcc -ar cr ${libdir}/libgetopt.a getopt.o
+
 cd ..