diff --git a/packages/libf2c/meta.yaml b/packages/libf2c/meta.yaml
index 6197a386d..1152dff7f 100644
--- a/packages/libf2c/meta.yaml
+++ b/packages/libf2c/meta.yaml
@@ -18,6 +18,9 @@ source:
     - patches/0003-remove-redundant-symbols.patch
     - patches/0004-correct-return-types.patch
     - patches/0005-Remove-symbols-defined-in-OpenBLAS.patch
+    # In CLAPACK's F2CLIBS/libf2c Makefile, some commands are mistakenly (?) hardcoded
+    # instead of using the right variables
+    - patches/0006-adjust-ld-ar-ranlib.patch
 
   extras:
     - [make.inc, make.inc]
@@ -31,12 +34,7 @@ build:
     # easier to debug.
     chmod -R o+rx .
 
-    # In CLAPACK's Makefiles, some commands are mistakenly (?) hardcoded
-    # instead of using the right variables
-    sed -i 's/^	-ranlib /^	$(RANLIB)/' **/Makefile
-    sed -i 's/^	ar /^	$(ARCH)/' **/Makefile
-    sed -i 's/^	ld /^	$(LD)/' **/Makefile
-
+    ARCH="emar" \
     emmake make -j ${PYODIDE_JOBS:-3} f2clib
     mkdir -p ${WASM_LIBRARY_DIR}/{lib,include}
     cp INCLUDE/f2c.h ${WASM_LIBRARY_DIR}/include
diff --git a/packages/libf2c/patches/0006-adjust-ld-ar-ranlib.patch b/packages/libf2c/patches/0006-adjust-ld-ar-ranlib.patch
new file mode 100644
index 000000000..336f37616
--- /dev/null
+++ b/packages/libf2c/patches/0006-adjust-ld-ar-ranlib.patch
@@ -0,0 +1,33 @@
+Index: CLAPACK-3.2.1/F2CLIBS/libf2c/Makefile
+===================================================================
+--- CLAPACK-3.2.1.orig/F2CLIBS/libf2c/Makefile
++++ CLAPACK-3.2.1/F2CLIBS/libf2c/Makefile
+@@ -70,8 +70,8 @@ OFILES = $(MISC) $(POW) $(CX) $(DCX) $(R
+ all: f2c.h signal1.h sysdep1.h libf2c.a clapack_install
+ 
+ libf2c.a: $(OFILES)
+-	ar r libf2c.a $?
+-	-ranlib libf2c.a
++	$(ARCH) r libf2c.a $?
++	$(RANLIB) libf2c.a
+ 
+ ## Shared-library variant: the following rule works on Linux
+ ## systems.  Details are system-dependent.  Under Linux, -fPIC
+@@ -80,7 +80,7 @@ libf2c.a: $(OFILES)
+ ## of "cc -shared".
+ 
+ libf2c.so: $(OFILES)
+-	cc -shared -o libf2c.so $(OFILES)
++	$(CC) -shared -o libf2c.so $(OFILES)
+ 
+ ### If your system lacks ranlib, you don't need it; see README.
+ 
+@@ -117,7 +117,7 @@ sysdep1.h: sysdep1.h0
+ 
+ install: libf2c.a
+ 	cp libf2c.a $(LIBDIR)
+-	-ranlib $(LIBDIR)/libf2c.a
++	$(RANLIB) $(LIBDIR)/libf2c.a
+ 
+ clapack_install: libf2c.a
+ 	mv libf2c.a ..