diff --git a/.forgejo/workflows/bootstrap.yml b/.forgejo/workflows/bootstrap.yml
index 926e4922..a41bb6e5 100644
--- a/.forgejo/workflows/bootstrap.yml
+++ b/.forgejo/workflows/bootstrap.yml
@@ -35,7 +35,7 @@ jobs:
           git checkout "${GITHUB_SHA}" 2>/dev/null || git checkout "${GITHUB_REF_NAME:-main}"
           git log --oneline -1
           # See ci.yml for why the Linux build injects the stdio shim via LUDIC_CC.
-          echo "LUDIC_CC=clang-16 $(pwd)/tools/ci/linux_stdio_shim.ll" >> "$GITHUB_ENV"
+          echo "LUDIC_CC=clang-16 $(pwd)/tools/ci/linux_stdio_shim.ll -lm" >> "$GITHUB_ENV"
           echo "LUDIC_HOME=$(pwd)" >> "$GITHUB_ENV"
 
       - name: Bootstrap x from the seed
diff --git a/.forgejo/workflows/ci.yml b/.forgejo/workflows/ci.yml
index afd5c567..04dd75a3 100644
--- a/.forgejo/workflows/ci.yml
+++ b/.forgejo/workflows/ci.yml
@@ -48,7 +48,7 @@ jobs:
           # LUDIC_CC so every clang invocation — the seed bootstrap, `ludic-dev build`,
           # and each compiled test program — picks it up. Absolute path so it
           # still resolves if a step changes directory.
-          echo "LUDIC_CC=clang-16 $(pwd)/tools/ci/linux_stdio_shim.ll" >> "$GITHUB_ENV"
+          echo "LUDIC_CC=clang-16 $(pwd)/tools/ci/linux_stdio_shim.ll -lm" >> "$GITHUB_ENV"
           echo "LUDIC_HOME=$(pwd)" >> "$GITHUB_ENV"
 
       - name: Bootstrap the toolchain from the IR seed (clang only)
diff --git a/.forgejo/workflows/docs.yml b/.forgejo/workflows/docs.yml
index fd8f5f20..b606bf3e 100644
--- a/.forgejo/workflows/docs.yml
+++ b/.forgejo/workflows/docs.yml
@@ -63,7 +63,7 @@ jobs:
           # tiny C-free IR shim supplying the Darwin stdout/stderr globals over
           # glibc's, injected through LUDIC_CC. docs-gen is a pure CLI (no
           # windowing), so the C-free bootstrap is all it needs.
-          export LUDIC_CC="clang-16 $(pwd)/tools/ci/linux_stdio_shim.ll"
+          export LUDIC_CC="clang-16 $(pwd)/tools/ci/linux_stdio_shim.ll -lm"
           export LUDIC_HOME="$(pwd)"
           mkdir -p bin
           clang-16 tools/ci/linux_stdio_shim.ll selfhost/ludicc.seed.ll -o bin/ludicc
diff --git a/.forgejo/workflows/release.yml b/.forgejo/workflows/release.yml
index 45e928e8..1e323525 100644
--- a/.forgejo/workflows/release.yml
+++ b/.forgejo/workflows/release.yml
@@ -49,7 +49,7 @@ jobs:
           git checkout "$TAG"
           echo "TAG=$TAG" >> "$GITHUB_ENV"
           # See ci.yml for why the Linux build injects the stdio shim via LUDIC_CC.
-          echo "LUDIC_CC=clang-16 $(pwd)/tools/ci/linux_stdio_shim.ll" >> "$GITHUB_ENV"
+          echo "LUDIC_CC=clang-16 $(pwd)/tools/ci/linux_stdio_shim.ll -lm" >> "$GITHUB_ENV"
           echo "LUDIC_HOME=$(pwd)" >> "$GITHUB_ENV"
 
       - name: The tag, VERSION and CHANGELOG must agree