diff --git a/steps-guix/manifest b/steps-guix/manifest
index e4aac5bb..7a5000f6 100644
--- a/steps-guix/manifest
+++ b/steps-guix/manifest
@@ -7,4 +7,5 @@ build: binutils-2.41
 build: gcc-15.2.0
 build: argp-standalone-1.4.1
 build: musl-fts-1.2.7
+build: musl-obstack-1.2.3
 build: elfutils-0.194
diff --git a/steps-guix/musl-obstack-1.2.3/pass1.sh b/steps-guix/musl-obstack-1.2.3/pass1.sh
new file mode 100644
index 00000000..2605b10e
--- /dev/null
+++ b/steps-guix/musl-obstack-1.2.3/pass1.sh
@@ -0,0 +1,34 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# Build musl-obstack for the kernel toolchain sysroot.
+: "${KERNEL_SYSROOT:=/kernel-toolchain}"
+
+src_prepare() {
+    default
+    autoreconf -fi
+}
+
+src_configure() {
+    mkdir build
+    cd build
+
+    CC=gcc \
+    AR=ar \
+    RANLIB=ranlib \
+    ../configure \
+        --prefix="${KERNEL_SYSROOT}" \
+        --libdir="${KERNEL_SYSROOT}/lib" \
+        --includedir="${KERNEL_SYSROOT}/include"
+}
+
+src_compile() {
+    default_src_compile
+}
+
+src_install() {
+    make "${MAKEJOBS}" install \
+        DESTDIR="${DESTDIR}" \
+        prefix="${KERNEL_SYSROOT}" \
+        libdir="${KERNEL_SYSROOT}/lib" \
+        includedir="${KERNEL_SYSROOT}/include"
+}
diff --git a/steps-guix/musl-obstack-1.2.3/sources b/steps-guix/musl-obstack-1.2.3/sources
new file mode 100644
index 00000000..95748e2c
--- /dev/null
+++ b/steps-guix/musl-obstack-1.2.3/sources
@@ -0,0 +1 @@
+f https://github.com/void-linux/musl-obstack/archive/refs/tags/v1.2.3.tar.gz 9ffb3479b15df0170eba4480e51723c3961dbe0b461ec289744622db03a69395 musl-obstack-1.2.3.tar.gz