diff --git a/sdk_container/src/third_party/portage-stable/app-text/mandoc/mandoc-1.14.6.ebuild b/sdk_container/src/third_party/portage-stable/app-text/mandoc/mandoc-1.14.6.ebuild
index e66c4176ee..69da5773bb 100644
--- a/sdk_container/src/third_party/portage-stable/app-text/mandoc/mandoc-1.14.6.ebuild
+++ b/sdk_container/src/third_party/portage-stable/app-text/mandoc/mandoc-1.14.6.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2024 Gentoo Authors
+# Copyright 1999-2025 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=7
@@ -92,6 +92,47 @@ src_prepare() {
 		MANM_TBL=mandoc_tbl
 		MANM_MANCONF=mman.conf
 	EOF
+	# Assuming modern Linux + glibc/musl and not BSD.
+	tc-is-cross-compiler && cat <<-EOF >> "configure.local"
+		HAVE_ATTRIBUTE=1
+		HAVE_CMSG=1
+		HAVE_DIRENT_NAMLEN=0
+		HAVE_EFTYPE=0
+		HAVE_ENDIAN=1
+		HAVE_ERR=1
+		HAVE_FTS_COMPARE_CONST=0
+		HAVE_FTS=$(usex elibc_glibc 1 0)
+		HAVE_GETLINE=1
+		HAVE_GETSUBOPT=1
+		HAVE_ISBLANK=1
+		HAVE_LESS_T=1
+		HAVE_MKDTEMP=1
+		HAVE_MKSTEMPS=1
+		HAVE_NANOSLEEP=1
+		HAVE_NTOHL=1
+		HAVE_O_DIRECTORY=1
+		HAVE_OHASH=0
+		HAVE_PATH_MAX=1
+		HAVE_PLEDGE=0
+		HAVE_PROGNAME=0
+		HAVE_REALLOCARRAY=1
+		HAVE_RECALLOCARRAY=0
+		HAVE_RECVMSG=1
+		HAVE_REWB_BSD=0
+		HAVE_REWB_SYSV=1
+		HAVE_SANDBOX_INIT=0
+		HAVE_STRCASESTR=$(usex elibc_glibc 1 0)
+		HAVE_STRINGLIST=0
+		HAVE_STRLCAT=$(usex elibc_glibc 1 0)
+		HAVE_STRLCPY=$(usex elibc_glibc 1 0)
+		HAVE_STRPTIME=1
+		HAVE_STRSEP=1
+		HAVE_STRTONUM=0
+		HAVE_SYS_ENDIAN=0
+		HAVE_VASPRINTF=1
+		HAVE_WCHAR=1
+		NEED_GNU_SOURCE=1
+	EOF
 	if use cgi; then
 		cp cgi.h{.example,} || die
 	fi