diff --git a/sci-visualization/scidavis/files/scidavis-qwtplot3d.patch b/sci-visualization/scidavis/files/scidavis-2.7-find-qwtplot3d.patch
similarity index 100%
rename from sci-visualization/scidavis/files/scidavis-qwtplot3d.patch
rename to sci-visualization/scidavis/files/scidavis-2.7-find-qwtplot3d.patch
diff --git a/sci-visualization/scidavis/files/scidavis-2.7-fix-build-if-sip4-installed.patch b/sci-visualization/scidavis/files/scidavis-2.7-fix-build-if-sip4-installed.patch
new file mode 100644
index 0000000000000..2b415458da22d
--- /dev/null
+++ b/sci-visualization/scidavis/files/scidavis-2.7-fix-build-if-sip4-installed.patch
@@ -0,0 +1,13 @@
+diff --git a/libscidavis/CMakeLists.txt b/libscidavis/CMakeLists.txt
+index 8fc6c4e3..27464ec2 100644
+--- a/libscidavis/CMakeLists.txt
++++ b/libscidavis/CMakeLists.txt
+@@ -483,7 +483,7 @@ if( SCRIPTING_PYTHON )
+   set(scidavis_PyQt_HDR ${scidavis_SIP_OUTPUT_DIR}/sipAPIscidavis.h)
+   if( SIP_VERSION VERSION_GREATER_EQUAL 5 )
+     set( scidavis_SIP_HDR ${CMAKE_CURRENT_BINARY_DIR}/python/sip.h )
+-    target_include_directories( libscidavis PUBLIC
++    target_include_directories( libscidavis BEFORE PUBLIC
+       "${CMAKE_CURRENT_BINARY_DIR}/python"
+       "${scidavis_SIP_OUTPUT_DIR}"
+     )
diff --git a/sci-visualization/scidavis/files/scidavis-muparser.patch b/sci-visualization/scidavis/files/scidavis-2.7-install-locations.patch
similarity index 100%
rename from sci-visualization/scidavis/files/scidavis-muparser.patch
rename to sci-visualization/scidavis/files/scidavis-2.7-install-locations.patch
diff --git a/sci-visualization/scidavis/metadata.xml b/sci-visualization/scidavis/metadata.xml
index 93c583ed2a8f1..1c44688f27111 100644
--- a/sci-visualization/scidavis/metadata.xml
+++ b/sci-visualization/scidavis/metadata.xml
@@ -16,7 +16,6 @@
 	<use>
 		<flag name="origin">Add support for reading OriginLab OPJ project files through <pkg>sci-libs/liborigin</pkg>.</flag>
 		<flag name="python">Build support for python scripting.</flag>
-		<flag name="muparser">Build support for muparser scripting.</flag>
 	</use>
 	<upstream>
 		<remote-id type="sourceforge">scidavis</remote-id>
diff --git a/sci-visualization/scidavis/scidavis-2.7.ebuild b/sci-visualization/scidavis/scidavis-2.7-r1.ebuild
similarity index 80%
rename from sci-visualization/scidavis/scidavis-2.7.ebuild
rename to sci-visualization/scidavis/scidavis-2.7-r1.ebuild
index d6d6452d9a35d..94668d6588f57 100644
--- a/sci-visualization/scidavis/scidavis-2.7.ebuild
+++ b/sci-visualization/scidavis/scidavis-2.7-r1.ebuild
@@ -18,7 +18,7 @@ LICENSE="GPL-2+ ZLIB"
 KEYWORDS="~amd64"
 SLOT="0"
 
-IUSE="doc +muparser origin python test"
+IUSE="doc origin python test"
 REQUIRED_USE="python? ( ${PYTHON_REQUIRED_USE} )"
 
 # requires network
@@ -26,7 +26,7 @@ RESTRICT="test"
 PROPERTIES="test_network"
 
 RDEPEND="
-	muparser? ( dev-cpp/muParser )
+	dev-cpp/muParser
 	dev-qt/qtcore:5
 	dev-qt/qtgui:5
 	dev-qt/qtnetwork:5
@@ -58,8 +58,9 @@ BDEPEND="
 "
 
 PATCHES=(
-	"${FILESDIR}/${PN}-muparser.patch"
-	"${FILESDIR}/${PN}-qwtplot3d.patch"
+	"${FILESDIR}/${P}-install-locations.patch"
+	"${FILESDIR}/${P}-find-qwtplot3d.patch"
+	"${FILESDIR}/${P}-fix-build-if-sip4-installed.patch"
 )
 
 src_prepare() {
@@ -76,12 +77,19 @@ src_prepare() {
 
 src_configure() {
 	local mycmakeargs=(
-		-DSCRIPTING_MUPARSER=$(usex muparser)
-		-DSCRIPTING_PYTHON=$(usex python)
-		-DPYTHON_SCRIPTDIR="$(python_get_scriptdir)"
+		# Even if we disable muparser scripting, we still need MuParser.h
+		# for Graph3D.cpp. So just enable it unconditionally. Bug 834074
+		-DSCRIPTING_MUPARSER=ON
 		-DORIGIN_IMPORT=$(usex origin)
+		-DSCRIPTING_PYTHON=$(usex python)
 		-DBUILD_TESTS=$(usex test)
 	)
+
+	if use python; then
+		mycmakeargs+=(
+			-DPYTHON_SCRIPTDIR="$(python_get_scriptdir)"
+		)
+	fi
 	cmake_src_configure
 }