diff --git a/README.md b/README.md
index 124776d6f4..61a47922d8 100644
--- a/README.md
+++ b/README.md
@@ -26,19 +26,18 @@ For other versions, check the git tags of this repository.
  * C++ compiler capable of building LLVM, Clang, and LLD from source (GCC 5.1+
    or Clang)
  * cmake 3.19 or later
- * make
+ * make, ninja, or any other build system supported by cmake
  * POSIX system (bash, mkdir, cd)
  * Python 3
 
 ## Build Instructions
 
 ```
-./build -j1 <arch>-<os>-<abi> baseline
+./build <arch>-<os>-<abi> baseline
 ```
 
 All parameters are required:
 
- * `-j1`: Replace with your jobs parameter to make.
  * `<arch>-<os>-<abi>`: Replace with one of the Supported Triples below, or use
    `native` for the `<arch>` value (e.g. `native-linux-gnu`) to use the native
     architecture.
@@ -46,6 +45,12 @@ All parameters are required:
    it will target a generic CPU for the target. `native` means it will target
    the native CPU. See the Zig documentation for more details.
 
+To use a non-default cmake generator, export the `CMAKE_GENERATOR` environment
+variable before calling `build`.
+
+If you aren't using a build system that builds in parallel by default (ie. make),
+export `CMAKE_BUILD_PARALLEL_LEVEL` to parallelize the build.
+
 If it succeeds, the output will be in `out/zig-triple-mcpu/`.
 
 ### Supported Triples
diff --git a/build b/build
index 1a42fb7683..6addead79c 100755
--- a/build
+++ b/build
@@ -2,9 +2,8 @@
 
 set -eu
 
-JOBS="$1"
-TARGET="$2" # Example: riscv64-linux-gnu
-MCPU="$3" # Examples: `baseline`, `native`, `generic+v7a`, or `arm1176jzf_s`
+TARGET="$1" # Example: riscv64-linux-gnu
+MCPU="$2" # Examples: `baseline`, `native`, `generic+v7a`, or `arm1176jzf_s`
 
 ROOTDIR="$(pwd)"
 ZIG_VERSION="0.11.0-dev.78+28288dcbb"
@@ -41,7 +40,7 @@ cmake "$ROOTDIR/llvm" \
   -DCLANG_INCLUDE_DOCS=OFF \
   -DLLVM_INCLUDE_DOCS=OFF \
   -DCMAKE_BUILD_TYPE=Release
-make "$JOBS" install
+cmake --build . --target install
 
 # Now we build Zig, still with system C/C++ compiler, linking against LLVM,
 # Clang, LLD we just built from source.
@@ -52,7 +51,7 @@ cmake "$ROOTDIR/zig" \
   -DCMAKE_PREFIX_PATH="$ROOTDIR/out/host" \
   -DCMAKE_BUILD_TYPE=Release \
   -DZIG_VERSION="$ZIG_VERSION"
-make "$JOBS" install
+cmake --build . --target install
 
 # Now we have Zig as a cross compiler.
 ZIG="$ROOTDIR/out/host/bin/zig"
@@ -73,7 +72,7 @@ cmake "$ROOTDIR/zlib" \
   -DCMAKE_RC_COMPILER="$ROOTDIR/out/host/bin/llvm-rc" \
   -DCMAKE_AR="$ROOTDIR/out/host/bin/llvm-ar" \
   -DCMAKE_RANLIB="$ROOTDIR/out/host/bin/llvm-ranlib"
-make "$JOBS" install
+cmake --build . --target install
 
 # Same deal for zstd.
 # The build system for zstd is whack so I just put all the files here.
@@ -161,13 +160,13 @@ cmake "$ROOTDIR/llvm" \
   -DLIBCLANG_BUILD_STATIC=ON \
   -DLLVM_DEFAULT_TARGET_TRIPLE="$TARGET"
 cd "$ROOTDIR/out/build-llvm-$TARGET-$MCPU/tools/lld"
-make "$JOBS" install
+cmake --build . --target install
 cd "$ROOTDIR/out/build-llvm-$TARGET-$MCPU/tools/clang/lib"
-make "$JOBS" install
+cmake --build . --target install
 cd "$ROOTDIR/out/build-llvm-$TARGET-$MCPU/lib"
-make "$JOBS" install
+cmake --build . --target install
 cd "$ROOTDIR/out/build-llvm-$TARGET-$MCPU"
-make "$JOBS" install-llvm-headers install-clang-headers install-LLVMSupport install-LLVMDemangle
+cmake --build . --target install-llvm-headers install-clang-headers install-LLVMSupport install-LLVMDemangle
 
 # Finally, we can cross compile Zig itself, with Zig.
 cd "$ROOTDIR/zig"