diff --git a/.github/workflows/builds.yml b/.github/workflows/builds.yml
new file mode 100644
index 0000000..f0bf258
--- /dev/null
+++ b/.github/workflows/builds.yml
@@ -0,0 +1,43 @@
+
+name: builds
+
+on: [push, pull_request]
+
+jobs:
+  build-windows:
+    runs-on: windows-2019
+    steps:
+      - name: checkout
+        uses: actions/checkout@v2
+      - name: build
+        shell: cmd
+        run: |
+          call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Auxiliary\Build\vcvarsall.bat" amd64
+          "C:\Program Files\Git\bin\bash.exe" "bin/bld_init.sh"
+          "C:\Program Files\Git\bin\bash.exe" "bin/all_dev_checks.sh"
+
+  build-linux:
+    runs-on: ubuntu-20.04
+    steps:
+      - name: checkout
+        uses: actions/checkout@v2
+      - name: build
+        shell: bash
+        run: |
+          ./bin/bld_init.sh
+          sed -i.bak 's/cl/clang/' local/compiler.sh
+          sed -i.bak 's/lld-link/clang/' local/linker.sh
+          ./bin/all_dev_checks.sh
+
+  build-macos:
+    runs-on: macos-11
+    steps:
+      - name: checkout
+        uses: actions/checkout@v2
+      - name: build
+        shell: bash
+        run: |
+          ./bin/bld_init.sh
+          sed -i.bak 's/cl/clang/' local/compiler.sh
+          sed -i.bak 's/lld-link/clang/' local/linker.sh
+          ./bin/all_dev_checks.sh
diff --git a/bin/all_dev_checks.sh b/bin/all_dev_checks.sh
index c3fc42f..5aaf4de 100755
--- a/bin/all_dev_checks.sh
+++ b/bin/all_dev_checks.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -eo pipefail
+
 ###### Get Paths ##############################################################
 og_path=$PWD
 cd "$(dirname "$0")"
diff --git a/bin/bld_core.sh b/bin/bld_core.sh
index 53236f0..67f40fc 100755
--- a/bin/bld_core.sh
+++ b/bin/bld_core.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -eo pipefail
+
 ###### Usage ##################################################################
 # ./bld_core.sh <command> [arguments ...]
 #
@@ -548,8 +550,8 @@ if [ "$OSTYPE" == "win32" ] ||
   os="windows"
 elif [ "$OSTYPE" == "linux-gnu" ]; then
   os="linux"
-elif [ "$OSTYPE" == "darwin" ]; then
-  os="osx"
+elif [[ "$OSTYPE" == "darwin"* ]]; then
+  os="mac"
 fi
 
 
@@ -593,13 +595,11 @@ fi
 
 
 ###### Binary File Extension ##################################################
-dot_ext_exe=""
+dot_ext_exe=".exe"
 dot_ext_dll=""
 if [ "$os" == "windows" ]; then
-  dot_ext_exe=".exe"
   dot_ext_dll=".dll"
 elif [ "$os" == "linux" ] || [ "$os" == "mac" ]; then
-  dot_ext_exe=""
   dot_ext_dll=".so"
 else
   echo "ERROR: binary extension not defined for OS: $os"
diff --git a/bin/bld_init.sh b/bin/bld_init.sh
index 6e4b212..2edb283 100755
--- a/bin/bld_init.sh
+++ b/bin/bld_init.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -eo pipefail
+
 ###### Usage ##################################################################
 # ./bld_init.sh
 # Clears out the local folder and populates it with default initial scripts.
diff --git a/bin/build_examples.sh b/bin/build_examples.sh
index ca7c95b..312fa56 100755
--- a/bin/build_examples.sh
+++ b/bin/build_examples.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -eo pipefail
+
 ###### Get Paths ##############################################################
 og_path=$PWD
 cd "$(dirname "$0")"
diff --git a/bin/build_tests.sh b/bin/build_tests.sh
index 65d48be..46bd735 100755
--- a/bin/build_tests.sh
+++ b/bin/build_tests.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -eo pipefail
+
 ###### Get Paths ##############################################################
 og_path=$PWD
 cd "$(dirname "$0")"
diff --git a/bin/local_defaults/default_arch.sh b/bin/local_defaults/default_arch.sh
old mode 100644
new mode 100755
diff --git a/bin/local_defaults/default_compile_mode.sh b/bin/local_defaults/default_compile_mode.sh
old mode 100644
new mode 100755
diff --git a/bin/local_defaults/default_compiler.sh b/bin/local_defaults/default_compiler.sh
old mode 100644
new mode 100755
diff --git a/bin/local_defaults/default_ctx.sh b/bin/local_defaults/default_ctx.sh
old mode 100644
new mode 100755
diff --git a/bin/local_defaults/default_linker.sh b/bin/local_defaults/default_linker.sh
old mode 100644
new mode 100755
diff --git a/bin/run_examples.sh b/bin/run_examples.sh
index 0c9a82e..0b0f24f 100755
--- a/bin/run_examples.sh
+++ b/bin/run_examples.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -eo pipefail
+
 ###### Get Paths ##############################################################
 og_path=$PWD
 cd "$(dirname "$0")"
@@ -12,8 +14,6 @@ echo ~~~ Running Expression Intro ~~~
 $build_path/expr_intro.exe $examps/expr/expr_intro.mdesk
 echo
 
-exit
-
 # Setup a big list of files for a few of the examples
 big_list=()
 big_list+=("$examps/intro/hello_world.mdesk")
diff --git a/bin/run_tests.sh b/bin/run_tests.sh
index d0af4d4..cd8a043 100755
--- a/bin/run_tests.sh
+++ b/bin/run_tests.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -eo pipefail
+
 ###### Get Paths ##############################################################
 og_path=$PWD
 cd "$(dirname "$0")"
diff --git a/examples/expr/expr_c_like.c b/examples/expr/expr_c_like.c
index 6ae99c3..fecacd1 100644
--- a/examples/expr/expr_c_like.c
+++ b/examples/expr/expr_c_like.c
@@ -181,7 +181,7 @@ int main(int argc, char **argv)
 #if 1
     char *argv_dummy[2] = {
         0,
-        "W:\\metadesk\\examples\\expr\\expr_c_like.mdesk",
+        "examples/expr/expr_c_like.mdesk",
     };
     argc = 2;
     argv = argv_dummy;
diff --git a/examples/expr/expr_intro.c b/examples/expr/expr_intro.c
index 1c3552f..7a93860 100644
--- a/examples/expr/expr_intro.c
+++ b/examples/expr/expr_intro.c
@@ -130,7 +130,7 @@ int main(int argc, char **argv)
 #if 1
     char *argv_dummy[2] = {
         0,
-        "W:\\metadesk\\examples\\expr\\expr_intro.mdesk",
+        "examples/expr/expr_intro.mdesk",
     };
     argc = 2;
     argv = argv_dummy;