diff --git a/Makefile b/Makefile
index 98e0916..73ee3e8 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,3 @@
-.SILENT: build install test-r6rs test-r6rs-docker test-r7rs test-r7rs-docker clean
-.PHONY: test-r6rs test-r7rs example.scm example.sps
 SCHEME=chibi
 RNRS=r7rs
 LIBRARY=system
@@ -23,9 +21,9 @@ endif
 all: build
 
 build: retropikzel/${LIBRARY}/LICENSE retropikzel/${LIBRARY}/VERSION
-	@rm -rf *.tgz
-	@echo "<pre>$$(cat retropikzel/${LIBRARY}/README.md)</pre>" > ${README}
-	@snow-chibi package --version=${VERSION} --authors=${AUTHOR} --doc=${README} --description="${DESCRIPTION}" ${LIBRARY_FILE}
+	rm -rf *.tgz
+	echo "<pre>$$(cat retropikzel/${LIBRARY}/README.md)</pre>" > ${README}
+	snow-chibi package --version=${VERSION} --authors=${AUTHOR} --doc=${README} --description="${DESCRIPTION}" ${LIBRARY_FILE}
 
 install:
 	snow-chibi install --impls=${SCHEME} ${SNOW_CHIBI_ARGS} ${PKG}
@@ -34,22 +32,22 @@ uninstall:
 	-snow-chibi remove --impls=${SCHEME} ${PKG}
 
 init-venv: build
-	@rm -rf venv
-	@scheme-venv ${SCHEME} ${RNRS} venv
-	@echo "(import (scheme base) (scheme write) (scheme read) (scheme char) (scheme file) (scheme process-context) (srfi 64) (retropikzel ${LIBRARY}))" > venv/test.scm
-	@printf "#!r6rs\n(import (rnrs) (srfi :64) (retropikzel ${LIBRARY}))" > venv/test.sps
-	@cat ${TESTFILE} >> venv/test.scm
-	@cat ${TESTFILE} >> venv/test.sps
-	@if [ "${RNRS}" = "r6rs" ]; then if [ -d ../foreign-c ]; then cp -r ../foreign-c/foreign venv/lib/; fi; fi
-	@if [ "${RNRS}" = "r6rs" ]; then cp -r retropikzel venv/lib/; fi
-	@if [ "${SCHEME}" = "chezs" ]; then ./venv/bin/akku install akku-r7rs chez-srfi; fi
-	@if [ "${SCHEME}" = "ikarus" ]; then ./venv/bin/akku install akku-r7rs chez-srfi; fi
-	@if [ "${SCHEME}" = "ironscheme" ]; then ./venv/bin/akku install akku-r7rs chez-srfi; fi
-	@if [ "${SCHEME}" = "racket" ]; then ./venv/bin/akku install akku-r7rs chez-srfi; fi
-	@if [ "${RNRS}" = "r6rs" ]; then ./venv/bin/akku install; fi
-	@if [ "${SCHEME}" = "chicken" ]; then ./venv/bin/snow-chibi install --always-yes srfi.64; fi
-	@if [ "${SCHEME}-${RNRS}" = "mosh-r7rs" ]; then ./venv/bin/snow-chibi install --always-yes srfi.64; fi
-	@if [ "${RNRS}" = "r7rs" ]; then ./venv/bin/snow-chibi install ${PKG}; fi
+	rm -rf venv
+	scheme-venv ${SCHEME} ${RNRS} venv
+	echo "(import (scheme base) (scheme write) (scheme read) (scheme char) (scheme file) (scheme process-context) (srfi 64) (retropikzel ${LIBRARY}))" > venv/test.scm
+	printf "#!r6rs\n(import (rnrs) (srfi :64) (retropikzel ${LIBRARY}))" > venv/test.sps
+	cat ${TESTFILE} >> venv/test.scm
+	cat ${TESTFILE} >> venv/test.sps
+	if [ "${RNRS}" = "r6rs" ]; then if [ -d ../foreign-c ]; then cp -r ../foreign-c/foreign venv/lib/; fi; fi
+	if [ "${RNRS}" = "r6rs" ]; then cp -r retropikzel venv/lib/; fi
+	if [ "${SCHEME}" = "chezs" ]; then ./venv/bin/akku install akku-r7rs chez-srfi; fi
+	if [ "${SCHEME}" = "ikarus" ]; then ./venv/bin/akku install akku-r7rs chez-srfi; fi
+	if [ "${SCHEME}" = "ironscheme" ]; then ./venv/bin/akku install akku-r7rs chez-srfi; fi
+	if [ "${SCHEME}" = "racket" ]; then ./venv/bin/akku install akku-r7rs chez-srfi; fi
+	if [ "${RNRS}" = "r6rs" ]; then ./venv/bin/akku install; fi
+	if [ "${SCHEME}" = "chicken" ]; then ./venv/bin/snow-chibi install --always-yes srfi.64; fi
+	if [ "${SCHEME}-${RNRS}" = "mosh-r7rs" ]; then ./venv/bin/snow-chibi install --always-yes srfi.64; fi
+	if [ "${RNRS}" = "r7rs" ]; then ./venv/bin/snow-chibi install ${PKG}; fi
 
 run-test: init-venv
 	if [ "${RNRS}" = "r6rs" ]; then ./venv/bin/scheme-compile venv/test.sps; fi
diff --git a/retropikzel/system.scm b/retropikzel/system.scm
index 04644ec..c6ca52b 100644
--- a/retropikzel/system.scm
+++ b/retropikzel/system.scm
@@ -1,8 +1,8 @@
-(define-c-library libc '("stdlib.h") libc-name '((additional-versions ("6"))))
+(define-c-library libc '("stdlib.h") #f '())
 (define-c-procedure c-system libc 'system 'int '(pointer))
 
 (define (system command)
-  (let* ((command-pointer (string->c-utf8 command))
+  (let* ((command-pointer (string->c-bytevector command))
          (result (c-system command-pointer)))
-    (c-free command-pointer)
+    (c-bytevector-free command-pointer)
     result))
diff --git a/retropikzel/system/VERSION b/retropikzel/system/VERSION
index 781dcb0..65087b4 100644
--- a/retropikzel/system/VERSION
+++ b/retropikzel/system/VERSION
@@ -1 +1 @@
-1.1.3
+1.1.4