diff --git a/math/blahtexml/Makefile b/math/blahtexml/Makefile
index 3619a4cf7b1a..49d63d8b5167 100644
--- a/math/blahtexml/Makefile
+++ b/math/blahtexml/Makefile
@@ -1,41 +1,27 @@
 PORTNAME=	blahtexml
 DISTVERSIONPREFIX=	v
 DISTVERSION=	1.0
 CATEGORIES=	math
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	TeX to MathML converter designed with MediaWiki in mind
 WWW=		http://gva.noekeon.org/blahtexml/
 
 LICENSE=	BSD3CLAUSE
 
-LIB_DEPENDS=	libiconv.so:converters/libiconv \
-		libxerces-c.so:textproc/xerces-c3
-
-USES=		gmake localbase:ldflags
+LIB_DEPENDS=	libxerces-c.so:textproc/xerces-c3
 
+USES=		gmake iconv localbase
+USE_CXXSTD=	c++11
 USE_GITHUB=	yes
 GH_ACCOUNT=	gvanas
 
 MAKEFILE=	makefile
-MAKE_ARGS=	CFLAGS="${CFLAGS}"
-
 ALL_TARGET=	blahtexml-linux
 
-LDFLAGS+=	-liconv
-
 PLIST_FILES=	bin/${PORTNAME}
 
-.include <bsd.port.options.mk>
-
-.if ${OPSYS} == FreeBSD && ( ${OSVERSION} >= 1400091 || ( ${OSVERSION} >= 1302507 && ${OSVERSION} < 1400000 ))
-USES+=	llvm:max=15
-CC=	clang${LLVM_VERSION}
-CPP=	clang-cpp${LLVM_VERSION}
-CXX=	clang++${LLVM_VERSION}
-.endif
-
 do-install:
 	${INSTALL_PROGRAM} ${WRKSRC}/${PORTNAME} ${STAGEDIR}${PREFIX}/bin
 
 .include <bsd.port.mk>
diff --git a/math/blahtexml/files/patch-makefile b/math/blahtexml/files/patch-makefile
index 870d18275743..5d1a851efca5 100644
--- a/math/blahtexml/files/patch-makefile
+++ b/math/blahtexml/files/patch-makefile
@@ -1,11 +1,20 @@
---- makefile.orig	2021-09-23 07:29:40 UTC
+--- makefile.orig	2023-03-27 19:53:27 UTC
 +++ makefile
-@@ -120,7 +120,7 @@ blahtex-mac: $(BINDIR) $(OBJECTS)  $(HEADERS)
+@@ -111,7 +111,7 @@ $(BINDIR)/%.o:%.c
+ 	$(CC) $(INCLUDES) $(CFLAGS) -c $< -o $@
+ 
+ $(BINDIR_XMLIN)/%.o:%.cpp
+-	$(CXX) $(INCLUDES) $(CFLAGS) -DBLAHTEXML_USING_XERCES -c $< -o $@
++	$(CXX) $(INCLUDES) $(CXXFLAGS) -DBLAHTEXML_USING_XERCES -c $< -o $@
+ 
+ $(BINDIR_XMLIN)/%.o:%.c
+ 	$(CC) $(INCLUDES) $(CFLAGS) -DBLAHTEXML_USING_XERCES -c $< -o $@
+@@ -123,7 +123,7 @@ blahtex-mac: $(BINDIR) $(OBJECTS)  $(HEADERS)
  	$(CXX) $(CFLAGS) -o blahtex -liconv $(OBJECTS)
  
  blahtexml-linux:  $(BINDIR_XMLIN) $(OBJECTS_XMLIN)  $(HEADERS_XMLIN)
 -	$(CXX) $(CFLAGS) -o blahtexml $(OBJECTS_XMLIN) -lxerces-c
-+	$(CXX) $(CFLAGS) $(LDFLAGS) -o blahtexml $(OBJECTS_XMLIN) -lxerces-c
++	$(CXX) $(CXXFLAGS) -o blahtexml $(OBJECTS_XMLIN) $(LIBS) -lxerces-c
  
  blahtexml-mac: $(BINDIR_XMLIN) $(OBJECTS_XMLIN)  $(HEADERS_XMLIN)
  	$(CXX) $(CFLAGS) -o blahtexml -liconv $(OBJECTS_XMLIN) -lxerces-c