Yes this is a surprise to me too. Tested on amd64.
The msgmerge utility can use OpenMP; turn off for now.
Index: Makefile
===================================================================
RCS file: /cvs/ports/devel/gettext/Makefile,v
retrieving revision 1.89
diff -u -p -r1.89 Makefile
--- Makefile 20 May 2019 23:45:47 -0000 1.89
+++ Makefile 5 Jul 2019 18:54:41 -0000
@@ -9,7 +9,7 @@ DISTNAME= gettext-${VERSION}
PKGNAME-runtime= gettext-runtime-${VERSION}
PKGNAME-textstyle= libtextstyle-${VERSION}
PKGNAME-tools= gettext-tools-${VERSION}
-REVISION-tools= 0
+REVISION-tools= 1
SHARED_LIBS += intl 6.0 # 9.6
SHARED_LIBS += asprintf 1.1 # unknown
@@ -52,6 +52,7 @@ CONFIGURE_STYLE=gnu
CONFIGURE_ARGS= --disable-csharp \
--disable-java \
--disable-acl \
+ --disable-openmp \
--with-libiconv-prefix="${LOCALBASE}" \
--with-included-gettext \
--with-included-libunistring \
