diff --git a/run_rustc/Makefile b/run_rustc/Makefile
index e78d8c5..00162a7 100644
--- a/run_rustc/Makefile
+++ b/run_rustc/Makefile
@@ -108,7 +108,7 @@ CARGO_FLAGS := --target $(RUSTC_TARGET) -j $(PARLEVEL) --release --verbose
 CARGO_ENV := CFG_COMPILER_HOST_TRIPLE=$(RUSTC_TARGET)
 CARGO_ENV += RUSTC_BOOTSTRAP=1
 CARGO_ENV += CARGO_HOME=$(CARGO_HOME)
-CARGO_ENV += RUSTFLAGS="-Z force-unstable-if-unmarked -C link_args=-Wl,-rpath,\$$ORIGIN/../lib -C target-feature=-crt-static"
+CARGO_ENV += RUSTFLAGS="-Z force-unstable-if-unmarked -C link_args=-Wl,-rpath,\$$ORIGIN/../lib -C target-feature=-crt-static -C link-self-contained=no"
 
 fn_opt_copy = (test -e "$2" && test ! "$1" -nt "$2") || cp "$1" "$2"
 
@@ -159,7 +159,7 @@ $(LIBDIR_S)libstd.rlib: $(BINDIR_S)rustc $(MINICARGO) Makefile
 	@echo "[MINICARGO] $(RUST_SRC_LIBS)std > $(LIBDIR_S)"
 	mkdir -p $(LIBDIR_S)
 ifneq ($(TARGETVER_LEAST_1_74),)
-	$V+STD_ENV_ARCH=$(RUSTC_ARCH) MRUSTC_PATH=$(abspath $(BINDIR_S)rustc) $(MINICARGO) --vendor-dir $(VENDOR_DIR) --script-overrides ../script-overrides/stable-$(RUSTC_VERSION)-$(PLATFORM)/ --output-dir $(LIBDIR_S) $(RUST_SRC_LIBS)sysroot
+	$V+STD_ENV_ARCH=$(RUSTC_ARCH) MRUSTC_PATH=$(abspath $(BINDIR_S)rustc) $(MINICARGO) --vendor-dir $(VENDOR_DIR) --script-overrides ../script-overrides/stable-$(RUSTC_VERSION)-$(PLATFORM)/ --output-dir $(LIBDIR_S) --target $(RUSTC_TARGET) $(RUST_SRC_LIBS)sysroot
 else
 	$V+MRUSTC_PATH=$(abspath $(BINDIR_S)rustc) $(MINICARGO) --vendor-dir $(VENDOR_DIR) --script-overrides ../script-overrides/stable-$(RUSTC_VERSION)-$(PLATFORM)/ --output-dir $(LIBDIR_S) $(RUST_SRC_LIBS)std
 	$V+MRUSTC_PATH=$(abspath $(BINDIR_S)rustc) $(MINICARGO) --vendor-dir $(VENDOR_DIR) --script-overrides ../script-overrides/stable-$(RUSTC_VERSION)-$(PLATFORM)/ --output-dir $(LIBDIR_S) $(RUST_SRC_LIBS)panic_unwind
@@ -169,7 +169,7 @@ endif
 # Build hello_world using the bootstrapping compiler (mrustc-built rustc)
 $(BINDIR_S)hello_world: $(RUST_SRC_HELLO) $(LIBDIR_S)libstd.rlib $(BINDIR_S)rustc
 	@mkdir -p $(dir $@)
-	$V$(BINDIR_S)rustc $(RUSTFLAGS_$@) -L $(LIBDIR_S) $< -o $@
+	$V$(BINDIR_S)rustc $(RUSTFLAGS_$@) --target $(RUSTC_TARGET) -C target-feature=-crt-static -C link-self-contained=no -L $(LIBDIR_S) $< -o $@
 
 # ---
 # Stage 2: Build a proper libstd (which includes dynamc libraries too)
@@ -259,7 +259,7 @@ endif
 $(BINDIR)hello_world: $(RUST_SRC_HELLO) $(BINDIR)rustc $(LIBDIR)libstd.rlib
 	@mkdir -p $(dir $@)
 	@echo "[RUSTC] -o $@"
-	$V$(DBG) $(BINDIR)rustc -L $(LIBDIR) $< -o $@
+	$V$(DBG) $(BINDIR)rustc --target $(RUSTC_TARGET) -C target-feature=-crt-static -C link-self-contained=no -L $(LIBDIR) $< -o $@
 	./$@
 
 #.PHONY: TEST_BOOTSTRAP
diff --git a/run_rustc/rustc_proxy.sh b/run_rustc/rustc_proxy.sh
index 3f4f2b9..78f6f1d 100755
--- a/run_rustc/rustc_proxy.sh
+++ b/run_rustc/rustc_proxy.sh
@@ -17,7 +17,12 @@ if is_target "$@"; then
     #echo "  [REAL]" "$@" >&2
     ${PROXY_RUSTC} "$@"
 else
+    # Host (build-script / proc-macro) build. With the musl-host stage0 rustc its
+    # default target IS x86_64-unknown-linux-musl, so no --target inject is needed
+    # (host==target==musl, proc-macros load natively). Just force dynamic +
+    # non-self-contained so the Alpine gcc supplies the CRT (the mrustc sysroot has
+    # no self-contained CRT dir, and musl's default is static-pie).
     #echo "  [BOOTSTRAP]" "$@" >&2
-    ${PROXY_MRUSTC} "$@"
+    ${PROXY_MRUSTC} -C target-feature=-crt-static -C link-self-contained=no "$@"
 fi