initial buildroot for linux 5.15

package/pngquant/Config.in

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+config BR2_PACKAGE_PNGQUANT
+	bool "pngquant"
+	select BR2_PACKAGE_LIBPNG
+	select BR2_PACKAGE_ZLIB
+	help
+	  Lossy PNG compressor - pngquant command and libimagequant
+	  library
+
+	  https://pngquant.org

package/pngquant/pngquant.hash

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+# From https://pngquant.org/releases.html
+sha256  06c6fdded675753fbdbeacc2b63507fb30f42fae813e48a1684b240bb5b63522  pngquant-2.16.0-src.tar.gz
+# Locally computed
+sha256  e4f467f7abf860b4e620f5f60fdd88bc3a63a0fdb98a481fb002b5e511c9b826  COPYRIGHT

package/pngquant/pngquant.mk

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+################################################################################
+#
+# pngquant
+#
+################################################################################
+
+PNGQUANT_VERSION = 2.16.0
+PNGQUANT_SOURCE = pngquant-$(PNGQUANT_VERSION)-src.tar.gz
+PNGQUANT_SITE = https://pngquant.org
+PNGQUANT_LICENSE = GPL-3.0+
+PNGQUANT_LICENSE_FILES = COPYRIGHT
+PNGQUANT_CPE_ID_VENDOR = pngquant
+HOST_PNGQUANT_DEPENDENCIES = host-libpng
+PNGQUANT_DEPENDENCIES = libpng
+
+ifeq ($(BR2_PACKAGE_LCMS2),y)
+PNGQUANT_DEPENDENCIES += lcms2
+endif
+
+define PNGQUANT_CONFIGURE_CMDS
+	(cd $(@D) && \
+		$(TARGET_CONFIGURE_OPTS) \
+		./configure --prefix=/usr \
+		$(if $(BR2_PACKAGE_LCMS2),--with-lcms2,--without-lcms2) \
+		$(if $(BR2_X86_CPU_HAS_SSE),--enable-sse,--disable-sse) \
+		$(TARGET_CONFIGURE_OPTS) \
+	)
+endef
+
+define PNGQUANT_BUILD_CMDS
+	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D)
+endef
+
+define PNGQUANT_INSTALL_TARGET_CMDS
+	$(TARGET_MAKE_ENV) $(MAKE) DESTDIR="$(TARGET_DIR)" -C $(@D) install
+endef
+
+define HOST_PNGQUANT_CONFIGURE_CMDS
+	(cd $(@D) && \
+		$(HOST_CONFIGURE_OPTS) \
+		CC=$(HOSTCC_NOCCACHE) \
+		./configure --prefix=$(HOST_DIR) \
+		--without-lcms2 \
+	)
+endef
+
+define HOST_PNGQUANT_BUILD_CMDS
+	$(HOST_MAKE_ENV) $(MAKE) -C $(@D)
+endef
+
+define HOST_PNGQUANT_INSTALL_CMDS
+	$(HOST_MAKE_ENV) $(MAKE) -C $(@D) install
+endef
+
+$(eval $(generic-package))
+$(eval $(host-generic-package))