diff --git a/racket/src/cs/c/configure b/racket/src/cs/c/configure
index 91bbe0c59b..efc3700787 100755
--- a/racket/src/cs/c/configure
+++ b/racket/src/cs/c/configure
@@ -5372,6 +5372,20 @@ SUB_CONFIGURE_EXTRAS="${SUB_CONFIGURE_EXTRAS} RANLIB="'"'"${RANLIB}"'"'
 SUB_CONFIGURE_EXTRAS="${SUB_CONFIGURE_EXTRAS} WINDRES="'"'"${WINDRES}"'"'
 SUB_CONFIGURE_EXTRAS="${SUB_CONFIGURE_EXTRAS} CPPFLAGS="'"'"${CPPFLAGS}"'"'
 
+# Make sure the --enable-pthread result is propagated:
+if test "${enable_pthread}" = "yes" ; then
+  SUB_CONFIGURE_EXTRAS="$SUB_CONFIGURE_EXTRAS --enable-pthread"
+else
+  SUB_CONFIGURE_EXTRAS="$SUB_CONFIGURE_EXTRAS --disable-pthread"
+fi
+
+# Make sure the --enable-iconv result is propagated:
+if test "${enable_iconv}" = "yes" ; then
+  SUB_CONFIGURE_EXTRAS="$SUB_CONFIGURE_EXTRAS --enable-iconv"
+else
+  SUB_CONFIGURE_EXTRAS="$SUB_CONFIGURE_EXTRAS --disable-iconv"
+fi
+
 ############## libtool ################
 
 if test "${enable_shared}" = "yes" ; then
diff --git a/racket/src/cs/c/configure.ac b/racket/src/cs/c/configure.ac
index 459fab06b9..2f1ad02079 100644
--- a/racket/src/cs/c/configure.ac
+++ b/racket/src/cs/c/configure.ac
@@ -601,6 +601,20 @@ SUB_CONFIGURE_EXTRAS="${SUB_CONFIGURE_EXTRAS} RANLIB="'"'"${RANLIB}"'"'
 SUB_CONFIGURE_EXTRAS="${SUB_CONFIGURE_EXTRAS} WINDRES="'"'"${WINDRES}"'"'
 SUB_CONFIGURE_EXTRAS="${SUB_CONFIGURE_EXTRAS} CPPFLAGS="'"'"${CPPFLAGS}"'"'
 
+# Make sure the --enable-pthread result is propagated:
+if test "${enable_pthread}" = "yes" ; then
+  SUB_CONFIGURE_EXTRAS="$SUB_CONFIGURE_EXTRAS --enable-pthread"
+else
+  SUB_CONFIGURE_EXTRAS="$SUB_CONFIGURE_EXTRAS --disable-pthread"
+fi
+
+# Make sure the --enable-iconv result is propagated:
+if test "${enable_iconv}" = "yes" ; then
+  SUB_CONFIGURE_EXTRAS="$SUB_CONFIGURE_EXTRAS --enable-iconv"
+else
+  SUB_CONFIGURE_EXTRAS="$SUB_CONFIGURE_EXTRAS --disable-iconv"
+fi
+
 ############## libtool ################
 
 if test "${enable_shared}" = "yes" ; then