Using src_configure to set destdir.

media-plugins/eq10q/Manifest

@@ -1,3 +1,3 @@
 DIST eq10q-2.2.tar.gz 797991 SHA256 337f4c703ba31902565faad1cd450cf0312ad5a48dc499661277f287b662b09a SHA512 4c6a79e9f1faeb431abd4e94b6bfa153b1ff5f55b3c2734d35a865ba23e3a7786ee45ee122cdcc26c9a8de915f1c4e2ec588a4c219ad6daf0ccf4a2b474b1e24 WHIRLPOOL 093cb2a2ce9ce7a8f7a0e8abb1faad01f9aa92204b134aee4214a56afcab84fa9d01c9ccfd7ab0e40bad54bc4cbaebe136c3e727dd040acd4f6b6a2fe0bc7c91
-EBUILD eq10q-2.2.ebuild 820 SHA256 579fd7e4c52569e3c5e3ff69677de8b033488aa1cafec0f3857030525cadad67 SHA512 781cbd2dee5adb4456f185fd9996322462c88b26a0fcdaa569d69da7e60649033ff8e01d2aa4ead7945d51e8fb751a95b377fd6411923daf69dab2345109a32a WHIRLPOOL edda929f6abaf25973b0927cc14dd7409e31a6d597efe6ac3fdbd72b0ecba26f1d96aaf10779d3452b93c37eb4eb20b9fd4e3ce1469c9d6035e1c7b538300267
+EBUILD eq10q-2.2.ebuild 924 SHA256 4c57c3d85da59b2b7423480235225951bb27f34b3947def4ceb6043deb43b0e6 SHA512 017bc7efca8e93fd880a5c12a810149af9dc5b06141c745631924dae7943950717bed810a34f8f416d08e755bd01d931b73615bb0656f6849415f4d5bc92d8c3 WHIRLPOOL 8d43098e70c0cc545bcf61f0458d687844c2dabdecf6026134e07599d88f60c3e20b231131a2baa50a3e0c2187efefd26d17888d671b006ad6e7eee2b8f18634
 MISC metadata.xml 452 SHA256 084de6052a264859503c3fed2c91730225655959d4330c60e7bd9b2a553e608e SHA512 6b70e7169ad3d9faa7629571f47c73e0f47fc06e54e7f0167462a729162ca061d989e22db051132e62e6edb9c9bd79396652b9c421922c876751420a829352b7 WHIRLPOOL 3116656536395ed71a64573ed63769fdeb9ca07be409448a8bd17cb09bf4b827474ea3bd982bbcdae4ed109ec5c680f74510fee415cb37c6685fcc1502ce88be

media-plugins/eq10q/eq10q-2.2.ebuild

@@ -22,6 +22,9 @@ DEPEND="${RDEPEND}
 	dev-util/cmake"
 
 src_configure() {
+        local mycmakeargs=(
+                -DCMAKE_INSTALL_PREFIX=/usr/$(get_libdir)/lv2
+        )
         cmake-utils_src_configure
 }
 
@@ -32,8 +35,8 @@ src_compile() {
 
 src_install() {
 	cmake-utils_src_install
-	insinto /usr/$(get_libdir)/lv2
-	doins "${FILESDIR}"/sapistaEQv2.lv2/
-	insinto /usr/share/doc
-	doins "${FILESDIR}"/share/doc/"${P}"
+	#insinto /usr/$(get_libdir)/lv2
+	#doins "${FILESDIR}"/sapistaEQv2.lv2/
+	#insinto /usr/share/doc
+	#doins "${FILESDIR}"/share/doc/"${P}"
 }