diff --git a/ci/azure/macos_script b/ci/azure/macos_script
index 4bb083e5e25f1619d74b63215a0057c761913090..c9adb84d496aece9769c84e2555745248af2d07b 100755
--- a/ci/azure/macos_script
+++ b/ci/azure/macos_script
@@ -49,6 +49,7 @@ unset CXX
 make $JOBS install
 
 stage3-release/bin/zig build test docs \
+  --zig-lib-dir ../lib \
   -Denable-macos-sdk \
   -Dstatic-llvm \
   --search-prefix "$PREFIX"
diff --git a/ci/azure/pipelines.yml b/ci/azure/pipelines.yml
index 45504c5b6ee91d444f8fc854926eddc4f64b7689..172336423d6b6856da19adda912a347c8c84283b 100644
--- a/ci/azure/pipelines.yml
+++ b/ci/azure/pipelines.yml
@@ -60,6 +60,7 @@ jobs:
     displayName: 'Build'
 
   - pwsh: |
+      Set-Variable -Name ZIGLIBDIR -Value "$(Get-Location)\lib"
       Set-Variable -Name ZIGINSTALLDIR -Value "$(Get-Location)\stage3-release"
 
       function CheckLastExitCode {
@@ -71,6 +72,7 @@ jobs:
 
       & "$ZIGINSTALLDIR\bin\zig.exe" build test docs `
         --search-prefix "$ZIGPREFIXPATH" `
+        --zig-lib-dir "$ZIGLIBDIR" `
         -Dstatic-llvm `
         -Dskip-non-native `
         -Dskip-stage2-tests
diff --git a/ci/drone/test_linux_behavior b/ci/drone/test_linux_behavior
index fb5b1fa9e483f3307ab9f52d22727094ded172bb..52ce24d68948219dbd7de281c96d5665b17f04f8 100755
--- a/ci/drone/test_linux_behavior
+++ b/ci/drone/test_linux_behavior
@@ -7,7 +7,7 @@ INSTALL_PREFIX="$DRONE_WORKSPACE/stage3-release"
 ZIG="$INSTALL_PREFIX/bin/zig"
 export ZIG_GLOBAL_CACHE_DIR="$DRONE_WORKSPACE/zig-cache"
 
-$ZIG build test-behavior    -Dskip-non-native
-$ZIG build test-compiler-rt -Dskip-non-native
-$ZIG build test-fmt
-$ZIG build docs
+$ZIG build test-behavior    -Dskip-non-native --zig-lib-dir lib
+$ZIG build test-compiler-rt -Dskip-non-native --zig-lib-dir lib
+$ZIG build test-fmt                           --zig-lib-dir lib
+$ZIG build docs                               --zig-lib-dir lib
diff --git a/ci/drone/test_linux_cases b/ci/drone/test_linux_cases
index 383ddf7b37165cee821cb53085d2f9208177f862..0b80345f84119eff01430a4d3742bc89d0d231bf 100755
--- a/ci/drone/test_linux_cases
+++ b/ci/drone/test_linux_cases
@@ -7,5 +7,6 @@ INSTALL_PREFIX="$DRONE_WORKSPACE/stage3-release"
 ZIG="$INSTALL_PREFIX/bin/zig"
 export ZIG_GLOBAL_CACHE_DIR="$DRONE_WORKSPACE/zig-cache"
 
-$ZIG build -Dskip-non-native # test building self-hosted without LLVM
-$ZIG build -Dskip-non-native test-cases
+# test building self-hosted without LLVM
+$ZIG build            -Dskip-non-native --zig-lib-dir lib
+$ZIG build test-cases -Dskip-non-native --zig-lib-dir lib
diff --git a/ci/drone/test_linux_misc b/ci/drone/test_linux_misc
index fc3dfcf4d4ce1e38bcec68a37c0d9616f5ab5c29..ef34f6d3d8583901616e0d26152f2ae54a51378f 100755
--- a/ci/drone/test_linux_misc
+++ b/ci/drone/test_linux_misc
@@ -7,10 +7,10 @@ INSTALL_PREFIX="$DRONE_WORKSPACE/stage3-release"
 ZIG="$INSTALL_PREFIX/bin/zig"
 export ZIG_GLOBAL_CACHE_DIR="$DRONE_WORKSPACE/zig-cache"
 
-$ZIG build test-universal-libc -Dskip-non-native
-$ZIG build test-compare-output -Dskip-non-native
-$ZIG build test-standalone     -Dskip-non-native -Dskip-release-safe
-$ZIG build test-stack-traces   -Dskip-non-native
-$ZIG build test-cli            -Dskip-non-native
-$ZIG build test-asm-link       -Dskip-non-native
-$ZIG build test-translate-c    -Dskip-non-native
+$ZIG build test-universal-libc -Dskip-non-native --zig-lib-dir lib
+$ZIG build test-compare-output -Dskip-non-native --zig-lib-dir lib
+$ZIG build test-standalone     -Dskip-non-native --zig-lib-dir lib -Dskip-release-safe
+$ZIG build test-stack-traces   -Dskip-non-native --zig-lib-dir lib
+$ZIG build test-cli            -Dskip-non-native --zig-lib-dir lib
+$ZIG build test-asm-link       -Dskip-non-native --zig-lib-dir lib
+$ZIG build test-translate-c    -Dskip-non-native --zig-lib-dir lib
diff --git a/ci/drone/test_linux_std_Debug b/ci/drone/test_linux_std_Debug
index d05554d5a5ca4bd2cbfe61a9eb8c34dfc0ec5b62..39558e19d1b8402e9d07935042968b92f92e9d62 100755
--- a/ci/drone/test_linux_std_Debug
+++ b/ci/drone/test_linux_std_Debug
@@ -7,4 +7,9 @@ INSTALL_PREFIX="$DRONE_WORKSPACE/stage3-release"
 ZIG="$INSTALL_PREFIX/bin/zig"
 export ZIG_GLOBAL_CACHE_DIR="$DRONE_WORKSPACE/zig-cache"
 
-$ZIG build test-std -Dskip-release-safe -Dskip-release-fast -Dskip-release-small -Dskip-non-native
+$ZIG build test-std \
+  --zig-lib-dir lib \
+  -Dskip-release-safe \
+  -Dskip-release-fast \
+  -Dskip-release-small \
+  -Dskip-non-native
diff --git a/ci/drone/test_linux_std_ReleaseFast b/ci/drone/test_linux_std_ReleaseFast
index 7e117b313a8511ea6799d705ca255de5f2e0b741..e42f4b6247417504f18ba98cebb1b07bbae0af6e 100755
--- a/ci/drone/test_linux_std_ReleaseFast
+++ b/ci/drone/test_linux_std_ReleaseFast
@@ -7,4 +7,10 @@ INSTALL_PREFIX="$DRONE_WORKSPACE/stage3-release"
 ZIG="$INSTALL_PREFIX/bin/zig"
 export ZIG_GLOBAL_CACHE_DIR="$DRONE_WORKSPACE/zig-cache"
 
-$ZIG build test-std -Dskip-debug -Dskip-release-safe -Dskip-release-small -Dskip-non-native -Dskip-single-threaded
+$ZIG build test-std \
+  --zig-lib-dir lib \
+  -Dskip-debug \
+  -Dskip-release-safe \
+  -Dskip-release-small \
+  -Dskip-non-native \
+  -Dskip-single-threaded
diff --git a/ci/drone/test_linux_std_ReleaseSafe b/ci/drone/test_linux_std_ReleaseSafe
index b494ea6e4743efe1335fc44832bcab73d1ccb378..fe8021827d788c0b4a264e5dccc33c11dc489d20 100755
--- a/ci/drone/test_linux_std_ReleaseSafe
+++ b/ci/drone/test_linux_std_ReleaseSafe
@@ -7,4 +7,10 @@ INSTALL_PREFIX="$DRONE_WORKSPACE/stage3-release"
 ZIG="$INSTALL_PREFIX/bin/zig"
 export ZIG_GLOBAL_CACHE_DIR="$DRONE_WORKSPACE/zig-cache"
 
-$ZIG build test-std -Dskip-debug -Dskip-release-fast -Dskip-release-small -Dskip-non-native -Dskip-single-threaded
+$ZIG build test-std \
+  --zig-lib-dir lib \
+  -Dskip-debug \
+  -Dskip-release-fast \
+  -Dskip-release-small \
+  -Dskip-non-native \
+  -Dskip-single-threaded
diff --git a/ci/drone/test_linux_std_ReleaseSmall b/ci/drone/test_linux_std_ReleaseSmall
index ffd366d4542725bc45011347685b94c438b8b4db..5b7821b4d9e67bd9628c128ba1858daf94b7177a 100755
--- a/ci/drone/test_linux_std_ReleaseSmall
+++ b/ci/drone/test_linux_std_ReleaseSmall
@@ -12,5 +12,5 @@ export ZIG_GLOBAL_CACHE_DIR="$DRONE_WORKSPACE/zig-cache"
 # of ReleaseSmall std lib tests.
 # $ZIG build test-std -Dskip-debug -Dskip-release-safe -Dskip-release-fast -Dskip-non-native
 
-$ZIG test lib/std/std.zig -OReleaseSmall
-$ZIG test lib/std/std.zig -OReleaseSmall -lc
+$ZIG test lib/std/std.zig -OReleaseSmall     --zig-lib-dir lib
+$ZIG test lib/std/std.zig -OReleaseSmall -lc --zig-lib-dir lib
diff --git a/ci/srht/freebsd_script b/ci/srht/freebsd_script
index 326e3cadf5542c0e9976bdd0f6b11514f57a694e..cf1d00d22cb4277fcade287376e996b4dc43ca31 100755
--- a/ci/srht/freebsd_script
+++ b/ci/srht/freebsd_script
@@ -56,6 +56,7 @@ ZIG_LIBC="$ZIG_LIBC_TXT" samu install
 
 # Here we skip some tests to save time.
 stage3/bin/zig build test docs \
+  --zig-lib-dir ../lib \
   -Dstatic-llvm \
   --search-prefix "$PREFIX" \
   -Dskip-stage1 \
diff --git a/ci/zinc/linux_test_stage3_debug b/ci/zinc/linux_test_stage3_debug
index 074e80d19bbc92e76b71b60b73f8a892d8e5d17e..7f871e39583667c65508ec0f894cb235c0d80f1f 100755
--- a/ci/zinc/linux_test_stage3_debug
+++ b/ci/zinc/linux_test_stage3_debug
@@ -55,7 +55,8 @@ stage3/bin/zig build test \
   -fwasmtime \
   -Dstatic-llvm \
   -Dtarget=native-native-musl \
-  --search-prefix "$DEPS_LOCAL"
+  --search-prefix "$DEPS_LOCAL" \
+  --zig-lib-dir ../lib
 
 # Explicit exit helps show last command duration.
 exit
diff --git a/ci/zinc/linux_test_stage3_release b/ci/zinc/linux_test_stage3_release
index 24bdde17d043abf3fe2b5f10222c7062a7aec74a..d450d7bc79f02de971c920587f3a5448c4b1d8ff 100755
--- a/ci/zinc/linux_test_stage3_release
+++ b/ci/zinc/linux_test_stage3_release
@@ -40,13 +40,15 @@ ninja install
   -fwasmtime \
   -Dstatic-llvm \
   -Dtarget=native-native-musl \
-  --search-prefix "$DEPS_LOCAL"
+  --search-prefix "$DEPS_LOCAL" \
+  --zig-lib-dir ../lib
 
 # Produce the experimental std lib documentation.
 mkdir -p "$RELEASE_STAGING/docs/std"
 "$RELEASE_STAGING/bin/zig" test ../lib/std/std.zig \
   -femit-docs=$RELEASE_STAGING/docs/std \
-  -fno-emit-bin
+  -fno-emit-bin \
+  --zig-lib-dir ../lib
 
 cp ../LICENSE $RELEASE_STAGING/
 cp ../zig-cache/langref.html $RELEASE_STAGING/docs/