diff --git a/build.sh b/build.sh
index bc6de20..27a0b89 100755
--- a/build.sh
+++ b/build.sh
@@ -57,7 +57,7 @@ fi
 
 # Install dependencies
 sudo apt update
-sudo apt install -y build-essential curl
+sudo apt install -y build-essential curl gnat-11
 sudo apt install -y libgmp-dev libmpfr-dev libmpc-dev zlib1g-dev libisl-dev libtinfo5 libncurses5
 
 pushd $_TMP_DIR
@@ -130,7 +130,7 @@ $GCC_SRC_DIR/configure \
         --enable-libatomic-ifuncs=no \
         --prefix=$_TMP_DIR/newer-toolchain \
         --with-gmp --with-mpfr --with-mpc --with-system-zlib \
-        --enable-languages=c,c++,fortran \
+        --enable-languages=c,c++,fortran,ada \
         --enable-plugins --enable-libgomp \
         --enable-gnu-indirect-function \
         --disable-libcilkrts --disable-libsanitizer \
diff --git a/patches/0005-ada-gnat-handler.patch b/patches/0005-ada-gnat-handler.patch
new file mode 100644
index 0000000..8dc4f5d
--- /dev/null
+++ b/patches/0005-ada-gnat-handler.patch
@@ -0,0 +1,13 @@
+This hanlder is only for arm (32-bit), so disable it on other archs.
+
+--- a/gcc/ada/init.c
++++ b/gcc/ada/init.c
+@@ -2631,7 +2631,7 @@
+   __gnat_handler_installed = 1;
+ }
+ 
+-#elif defined(__ANDROID__)
++#elif defined(__ANDROID__) && defined(__arm__)
+ 
+ /*******************/
+ /* Android Section */
diff --git a/patches/0006-ada-libgnarl-syscall.patch b/patches/0006-ada-libgnarl-syscall.patch
new file mode 100644
index 0000000..ce10b94
--- /dev/null
+++ b/patches/0006-ada-libgnarl-syscall.patch
@@ -0,0 +1,22 @@
+Fix error like `a-intnam.ads:164:25: "SIGSYS" not declared in "OS_Interface"` on ARM (32-bit)
+
+--- a/gcc/ada/libgnarl/s-linux__android.ads
++++ b/gcc/ada/libgnarl/s-linux__android.ads
+@@ -109,6 +109,7 @@
+    SIGPROF    : constant := 27; --  profiling timer expired
+    SIGXCPU    : constant := 24; --  CPU time limit exceeded
+    SIGXFSZ    : constant := 25; --  filesize limit exceeded
++   SIGSYS     : constant := 31; --  bad system call
+    SIGUNUSED  : constant := 31; --  unused signal (GNU/Linux)
+    SIGSTKFLT  : constant := 16; --  coprocessor stack fault (Linux)
+    SIG32      : constant := 32; --  glibc internal signal
+--- a/gcc/ada/libgnarl/s-osinte__android.ads
++++ b/gcc/ada/libgnarl/s-osinte__android.ads
+@@ -112,6 +112,7 @@
+    SIGPROF    : constant := System.Linux.SIGPROF;
+    SIGXCPU    : constant := System.Linux.SIGXCPU;
+    SIGXFSZ    : constant := System.Linux.SIGXFSZ;
++   SIGSYS     : constant := System.Linux.SIGSYS;
+    SIGUNUSED  : constant := System.Linux.SIGUNUSED;
+    SIGSTKFLT  : constant := System.Linux.SIGSTKFLT;
+ 
diff --git a/patches/0007-ada-x64-nallfl.patch b/patches/0007-ada-x64-nallfl.patch
new file mode 100644
index 0000000..6d6aa97
--- /dev/null
+++ b/patches/0007-ada-x64-nallfl.patch
@@ -0,0 +1,16 @@
+Fix error like following on x86_64.
+
+a-nallfl.ads:48:13: warning: intrinsic binding type mismatch on return value
+a-nallfl.ads:48:13: warning: intrinsic binding type mismatch on argument 1
+a-nallfl.ads:48:13: warning: profile of "Sin" doesn't match the builtin it binds
+
+--- a/gcc/ada/Makefile.rtl
++++ b/gcc/ada/Makefile.rtl
+@@ -2685,6 +2685,7 @@
+   a-exetim.adb<libgnarl/a-exetim__posix.adb \
+   a-exetim.ads<libgnarl/a-exetim__default.ads \
+   a-intnam.ads<libgnarl/a-intnam__linux.ads \
++  a-nallfl.ads<libgnat/a-nallfl__wraplf.ads \
+   a-synbar.adb<libgnarl/a-synbar__posix.adb \
+   a-synbar.ads<libgnarl/a-synbar__posix.ads \
+   s-inmaop.adb<libgnarl/s-inmaop__posix.adb \