Use working Chez runtime for Docker static Qt build

ober

d24e16b47e6ed65fed3b7a00e84bf0c685968008

diff --git a/Dockerfile.qt b/Dockerfile.qt
index 410bb66..140f75e 100644
--- a/Dockerfile.qt
+++ b/Dockerfile.qt
@@ -278,8 +278,8 @@ COPY --from=qt-alpine /usr/include/vterm.h /usr/local/include/
 # Copy pre-compiled Qt shim (Alpine-musl g++, so ABI-compatible with musl final link)
 COPY --from=qt-shim-alpine /tmp/qt-shim-out/ /opt/qt-shim/
 
-# Create /opt/chez symlink → /build/chez-musl (musl Chez Scheme)
-RUN ln -s /build/chez-musl /opt/chez
+# Create /opt/chez compatibility symlink to the working Chez in jerboa21/jerboa
+RUN ln -s /usr/local /opt/chez
 
 # Copy source and run the in-container build
 COPY . /src
@@ -287,7 +287,7 @@ WORKDIR /src
 
 ARG JEMACS_FEATURES=""
 ENV JEMACS_FEATURES=${JEMACS_FEATURES}
-RUN make linux-qt-local
+RUN make linux-qt-local MUSL_CHEZ_ROOT=/usr/local MUSL_SCHEME=/usr/local/bin/scheme
 
 # Verify
 RUN ./jemacs-qt --version && \
diff --git a/Makefile b/Makefile
index eb29469..32e97d7 100644
--- a/Makefile
+++ b/Makefile
@@ -1294,8 +1294,11 @@ linux-static-tui-podman: vendor-deps ensure-podman-deps
 # Static TUI via the native Linux musl toolchain.
 # =============================================================================
 
-MUSL_CHEZ_ROOT ?= $(shell for d in /build/chez-musl "$(HOME)/chez-musl"; do \
-	if [ -x "$$d/bin/scheme" ]; then printf '%s\n' "$$d"; break; fi; \
+MUSL_CHEZ_ROOT ?= $(shell for d in /usr/local /build/chez-musl "$(HOME)/chez-musl"; do \
+	if [ -x "$$d/bin/scheme" ] && \
+	   printf '(display (machine-type))\n' | "$$d/bin/scheme" -q >/dev/null 2>&1; then \
+	  printf '%s\n' "$$d"; break; \
+	fi; \
 	done)
 MUSL_SCHEME ?= $(if $(MUSL_CHEZ_ROOT),$(MUSL_CHEZ_ROOT)/bin/scheme,/usr/local/bin/scheme)
 MUSL_CHEZ_DIR ?= $(shell scheme_root=$$(dirname "$$(dirname "$(MUSL_SCHEME)")"); \