--- a/build
+++ b/build
@@ -24,7 +24,7 @@
 # First build the libraries for Zig to link against, as well as native `llvm-tblgen`.
 mkdir -p "$ROOTDIR/out/build-llvm-host"
 cd "$ROOTDIR/out/build-llvm-host"
-cmake "$ROOTDIR/llvm" \
+cmake -G Ninja "$ROOTDIR/llvm" \
   -DCMAKE_INSTALL_PREFIX="$ROOTDIR/out/host" \
   -DCMAKE_PREFIX_PATH="$ROOTDIR/out/host" \
   -DCMAKE_BUILD_TYPE=Release \
@@ -51,18 +51,18 @@
   -DCLANG_TOOL_ARCMT_TEST_BUILD=OFF \
   -DCLANG_TOOL_C_ARCMT_TEST_BUILD=OFF \
   -DCLANG_TOOL_LIBCLANG_BUILD=OFF
-cmake --build . --target install
+ninja -j"${TERMUX_PKG_MAKE_PROCESSES}" install
 
 # Now we build Zig, still with system C/C++ compiler, linking against LLVM,
 # Clang, LLD we just built from source.
 mkdir -p "$ROOTDIR/out/build-zig-host"
 cd "$ROOTDIR/out/build-zig-host"
-cmake "$ROOTDIR/zig" \
+cmake -G Ninja "$ROOTDIR/zig" \
   -DCMAKE_INSTALL_PREFIX="$ROOTDIR/out/host" \
   -DCMAKE_PREFIX_PATH="$ROOTDIR/out/host" \
   -DCMAKE_BUILD_TYPE=Release \
   -DZIG_VERSION="$ZIG_VERSION"
-cmake --build . --target install
+ninja -j"${TERMUX_PKG_MAKE_PROCESSES}" install
 
 # Now we have Zig as a cross compiler.
 ZIG="$ROOTDIR/out/host/bin/zig"
@@ -71,7 +71,7 @@
 # the final zig binary to have zlib support enabled.
 mkdir -p "$ROOTDIR/out/build-zlib-$TARGET-$MCPU"
 cd "$ROOTDIR/out/build-zlib-$TARGET-$MCPU"
-cmake "$ROOTDIR/zlib" \
+cmake -G Ninja "$ROOTDIR/zlib" \
   -DCMAKE_INSTALL_PREFIX="$ROOTDIR/out/$TARGET-$MCPU" \
   -DCMAKE_PREFIX_PATH="$ROOTDIR/out/$TARGET-$MCPU" \
   -DCMAKE_BUILD_TYPE=Release \
@@ -83,7 +83,7 @@
   -DCMAKE_RC_COMPILER="$ROOTDIR/out/host/bin/llvm-rc" \
   -DCMAKE_AR="$ROOTDIR/out/host/bin/llvm-ar" \
   -DCMAKE_RANLIB="$ROOTDIR/out/host/bin/llvm-ranlib"
-cmake --build . --target install
+ninja -j"${TERMUX_PKG_MAKE_PROCESSES}" install
 
 # Same deal for zstd.
 # The build system for zstd is whack so I just put all the files here.
@@ -133,7 +133,7 @@
 # Rebuild LLVM with Zig.
 mkdir -p "$ROOTDIR/out/build-llvm-$TARGET-$MCPU"
 cd "$ROOTDIR/out/build-llvm-$TARGET-$MCPU"
-cmake "$ROOTDIR/llvm" \
+cmake -G Ninja "$ROOTDIR/llvm" \
   -DCMAKE_INSTALL_PREFIX="$ROOTDIR/out/$TARGET-$MCPU" \
   -DCMAKE_PREFIX_PATH="$ROOTDIR/out/$TARGET-$MCPU" \
   -DCMAKE_BUILD_TYPE=Release \
@@ -186,7 +186,7 @@
   -DCLANG_TOOL_LIBCLANG_BUILD=OFF \
   -DLIBCLANG_BUILD_STATIC=ON \
   -DLLD_BUILD_TOOLS=OFF
-cmake --build . --target install
+ninja -j"${TERMUX_PKG_MAKE_PROCESSES}" install
 
 # Finally, we can cross compile Zig itself, with Zig.
 cd "$ROOTDIR/zig"