installer: style cleanups, fix build. (#9369)

dev-python/installer/installer-0.7.0.recipe

@@ -10,7 +10,7 @@ wheels.
 HOMEPAGE="https://pypi.org/project/installer/"
 COPYRIGHT="2020 Pradyun Gedam"
 LICENSE="MIT"
-REVISION="3"
+REVISION="4"
 SOURCE_URI="https://pypi.io/packages/source/i/installer/installer-$portVersion.tar.gz"
 CHECKSUM_SHA256="a26d3e3116289bb08216e0d0f7d925fcef0b0194eedfa0c944bcaaa106c4b631"
 
@@ -30,19 +30,23 @@ BUILD_REQUIRES="
 PYTHON_PACKAGES=(python39 python310)
 PYTHON_VERSIONS=(3.9 3.10)
 for i in "${!PYTHON_PACKAGES[@]}"; do
-pythonPackage=${PYTHON_PACKAGES[i]}
-pythonVersion=${PYTHON_VERSIONS[$i]}
-eval "PROVIDES_${pythonPackage}=\"\
-	${portName}_$pythonPackage = $portVersion\
-	\"; \
-REQUIRES_$pythonPackage=\"\
-	haiku\n\
-	cmd:python$pythonVersion\
-	\""
-BUILD_REQUIRES="$BUILD_REQUIRES
-	build_$pythonPackage"
-BUILD_PREREQUIRES="$BUILD_PREREQUIRES
-	cmd:python$pythonVersion"
+	pythonPackage=${PYTHON_PACKAGES[i]}
+	pythonVersion=${PYTHON_VERSIONS[$i]}
+
+	eval "PROVIDES_${pythonPackage}=\"
+		${portName}_$pythonPackage = $portVersion
+		\""
+	eval "REQUIRES_$pythonPackage=\"
+		haiku
+		cmd:python$pythonVersion
+		\""
+	BUILD_REQUIRES+="
+		build_$pythonPackage
+		flit_core_$pythonPackage
+		"
+	BUILD_PREREQUIRES+="
+		cmd:python$pythonVersion
+		"
 done
 
 INSTALL()
@@ -53,7 +57,7 @@ INSTALL()
 		$python -m build -wn --skip-dependency-check
 		PYTHONPATH=src $python -m installer --prefix=$prefix dist/*.whl
 
-		packageEntries  ${PYTHON_PACKAGES[i]} \
+		packageEntries ${PYTHON_PACKAGES[i]} \
 			$prefix/lib/python*
 	done
 }