use sphinx-build-3 to build documentation; breakage reported by naddy@ and sthen@

x11/polybar/Makefile

@@ -1,4 +1,4 @@
-# $OpenBSD: Makefile,v 1.5 2019/11/03 11:43:17 jasper Exp $
+# $OpenBSD: Makefile,v 1.6 2019/11/04 19:14:00 jasper Exp $
 
 COMMENT =	fast and easy-to-use status bar
 V =		3.4.1
@@ -49,7 +49,9 @@ NO_TEST =	Yes
 WRKDIST =	${WRKDIR}/polybar
 
 pre-configure:
-	${SUBST_CMD} ${WRKSRC}/lib/i3ipcpp/CMakeLists.txt
+	${SUBST_CMD} ${WRKSRC}/cmake/02-opts.cmake \
+		${WRKSRC}/doc/CMakeLists.txt \
+		${WRKSRC}/lib/i3ipcpp/CMakeLists.txt
 
 post-install:
 	${INSTALL_DATA_DIR} ${PREFIX}/share/examples/polybar

x11/polybar/patches/patch-cmake_02-opts_cmake

@@ -0,0 +1,14 @@
+$OpenBSD: patch-cmake_02-opts_cmake,v 1.1 2019/11/04 19:14:00 jasper Exp $
+
+Index: cmake/02-opts.cmake
+--- cmake/02-opts.cmake.orig
++++ cmake/02-opts.cmake
+@@ -1,7 +1,7 @@
+ #
+ # Build options
+ #
+-checklib(BUILD_DOC "binary" sphinx-build)
++checklib(BUILD_DOC "binary" sphinx-build${MODPY_BIN_SUFFIX})
+ 
+ checklib(ENABLE_ALSA "pkg-config" alsa)
+ checklib(ENABLE_CURL "pkg-config" libcurl)

x11/polybar/patches/patch-doc_CMakeLists_txt

@@ -0,0 +1,14 @@
+$OpenBSD: patch-doc_CMakeLists_txt,v 1.1 2019/11/04 19:14:00 jasper Exp $
+
+Index: doc/CMakeLists.txt
+--- doc/CMakeLists.txt.orig
++++ doc/CMakeLists.txt
+@@ -4,7 +4,7 @@ cmake_minimum_required(VERSION 3.1.0 FATAL_ERROR)
+ project(polybar-doc NONE)
+ 
+ find_program(SPHINX_EXECUTABLE
+-  NAMES sphinx-build
++  NAMES sphinx-build${MODPY_BIN_SUFFIX}
+   DOC "Sphinx Documentation Builder")
+ 
+ if(NOT SPHINX_EXECUTABLE)