diff --git a/games-misc/ballerburg/ballerburg-1.2.0-r1.ebuild b/games-misc/ballerburg/ballerburg-1.2.0-r1.ebuild
index e4a987433010..6b15169bd6a3 100644
--- a/games-misc/ballerburg/ballerburg-1.2.0-r1.ebuild
+++ b/games-misc/ballerburg/ballerburg-1.2.0-r1.ebuild
@@ -1,13 +1,14 @@
-# Copyright 1999-2020 Gentoo Authors
+# Copyright 1999-2021 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
-EAPI=6
+EAPI=7
 
-inherit cmake-utils
+CMAKE_MAKEFILE_GENERATOR=emake
+inherit cmake
 
 DESCRIPTION="Linux port of the classical Atari ST game Ballerburg"
-HOMEPAGE="http://baller.tuxfamily.org/"
-SRC_URI="http://download.tuxfamily.org/baller/${P}.tar.gz"
+HOMEPAGE="https://baller.tuxfamily.org/"
+SRC_URI="https://download.tuxfamily.org/baller/${P}.tar.gz"
 
 LICENSE="GPL-3+"
 SLOT="0"
@@ -16,14 +17,11 @@ KEYWORDS="~amd64"
 DEPEND="media-libs/libsdl"
 RDEPEND="${DEPEND}"
 
+PATCHES=( "${FILESDIR}/${P}-nomancompress.patch" )
+
 src_configure() {
 	local mycmakeargs=(
 		-DDOCDIR=share/doc/${PF}
 	)
-	cmake-utils_src_configure
-}
-
-src_install() {
-	cmake-utils_src_install
-	gunzip "${ED}usr/share/man/man6/ballerburg.6.gz" || die
+	cmake_src_configure
 }
diff --git a/games-misc/ballerburg/files/ballerburg-1.2.0-nomancompress.patch b/games-misc/ballerburg/files/ballerburg-1.2.0-nomancompress.patch
new file mode 100644
index 000000000000..1d12b1b82e1f
--- /dev/null
+++ b/games-misc/ballerburg/files/ballerburg-1.2.0-nomancompress.patch
@@ -0,0 +1,12 @@
+--- a/doc/CMakeLists.txt	2015-03-29 17:04:01.000000000 +0200
++++ b/doc/CMakeLists.txt	2021-02-27 22:56:13.025989166 +0100
+@@ -1,8 +1,3 @@
+ 
+ INSTALL(FILES de/anleitung.html en/manual.html  DESTINATION ${DOCDIR})
+-
+-add_custom_target(manpages ALL DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/ballerburg.6.gz)
+-add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/ballerburg.6.gz
+-	COMMAND gzip -c -9 ${CMAKE_CURRENT_SOURCE_DIR}/ballerburg.6 > ${CMAKE_CURRENT_BINARY_DIR}/ballerburg.6.gz
+-	DEPENDS ballerburg.6)
+-INSTALL(FILES  ${CMAKE_CURRENT_BINARY_DIR}/ballerburg.6.gz DESTINATION ${MANDIR})
++INSTALL(FILES ballerburg.6 DESTINATION ${MANDIR})