diff --git a/ci/build.sh b/ci/build.sh
index 7914a71c21494..a593055834156 100644
--- a/ci/build.sh
+++ b/ci/build.sh
@@ -216,6 +216,7 @@ for TARGET in $TARGETS; do
     fi
 done
 
+# Targets which are not available via rustup and must be built with -Zbuild-std
 RUST_LINUX_NO_CORE_TARGETS="\
 aarch64-pc-windows-msvc \
 aarch64-unknown-freebsd \
@@ -225,6 +226,7 @@ aarch64-unknown-openbsd \
 aarch64-wrs-vxworks \
 armebv7r-none-eabi \
 armebv7r-none-eabihf \
+armv7-unknown-linux-uclibceabihf \
 armv7-wrs-vxworks-eabihf \
 armv7r-none-eabi \
 armv7r-none-eabihf \
diff --git a/src/unix/linux_like/linux/gnu/mod.rs b/src/unix/linux_like/linux/gnu/mod.rs
index 69f1e01440abd..f1d4a109164e6 100644
--- a/src/unix/linux_like/linux/gnu/mod.rs
+++ b/src/unix/linux_like/linux/gnu/mod.rs
@@ -1333,6 +1333,8 @@ extern "C" {
     pub fn pthread_setname_np(thread: ::pthread_t, name: *const ::c_char) -> ::c_int;
 
     pub fn sethostid(hostid: ::c_long) -> ::c_int;
+
+    pub fn memfd_create(name: *const ::c_char, flags: ::c_uint) -> ::c_int;
 }
 
 extern "C" {
diff --git a/src/unix/linux_like/linux/mod.rs b/src/unix/linux_like/linux/mod.rs
index b4eb0d006268f..ed70756a0e627 100644
--- a/src/unix/linux_like/linux/mod.rs
+++ b/src/unix/linux_like/linux/mod.rs
@@ -3923,8 +3923,6 @@ extern "C" {
         needlelen: ::size_t,
     ) -> *mut ::c_void;
     pub fn sched_getcpu() -> ::c_int;
-
-    pub fn memfd_create(name: *const ::c_char, flags: ::c_uint) -> ::c_int;
 }
 
 cfg_if! {
diff --git a/src/unix/linux_like/linux/musl/mod.rs b/src/unix/linux_like/linux/musl/mod.rs
index 78b0c3e1500d3..463b6831cca6a 100644
--- a/src/unix/linux_like/linux/musl/mod.rs
+++ b/src/unix/linux_like/linux/musl/mod.rs
@@ -770,6 +770,8 @@ extern "C" {
     pub fn clock_adjtime(clk_id: ::clockid_t, buf: *mut ::timex) -> ::c_int;
 
     pub fn ctermid(s: *mut ::c_char) -> *mut ::c_char;
+
+    pub fn memfd_create(name: *const ::c_char, flags: ::c_uint) -> ::c_int;
 }
 
 cfg_if! {