```bitbake
SUMMARY = "Building and installing bootgen"
DESCRIPTION = "Building and installing bootgen, a Xilinx tool that lets you stitch binary files together and generate device boot images"

LICENSE = "Apache-2.0"
LIC_FILES_CHKSUM = "file://LICENSE;md5=d526b6d0807bf263b97da1da876f39b1"

S = "${WORKDIR}/git"

DEPENDS += "openssl"
RDEPENDS:${PN} += "openssl"

REPO ?= "git://github.com/Xilinx/bootgen.git;protocol=https"
BRANCH ?= "xlnx_rel_v2021.2"
SRCREV = "f196bddc500dfb244aeabba264e66358c35d51dd"

BRANCHARG = "${@['nobranch=1', 'branch=${BRANCH}'][d.getVar('BRANCH', True) != '']}"
SRC_URI = "${REPO};${BRANCHARG}"

EXTRA_OEMAKE += 'CROSS_COMPILER="${CXX}" -C ${S}'
CXXFLAGS:append = " -std=c++0x"

TARGET_CC_ARCH += "${LDFLAGS}"

do_install() {
    install -d ${D}${bindir}
    install -Dm 0755 ${S}/bootgen ${D}${bindir}
}

FILES:${PN} = "${bindir}/bootgen"

BBCLASSEXTEND = "native nativesdk"
```

Update to bootgen SRCREV to point to latest commit on branch.
user
```bitbake
SUMMARY = "Building and installing bootgen"
DESCRIPTION = "Building and installing bootgen, a Xilinx tool that lets you stitch binary files together and generate device boot images"

LICENSE = "Apache-2.0"
LIC_FILES_CHKSUM = "file://LICENSE;md5=d526b6d0807bf263b97da1da876f39b1"

S = "${WORKDIR}/git"

DEPENDS += "openssl"
RDEPENDS:${PN} += "openssl"

REPO ?= "git://github.com/Xilinx/bootgen.git;protocol=https"
BRANCH ?= "xlnx_rel_v2021.2"
SRCREV = "5b6fe16a2bfd7ced4d90b70b0ba6fbf325e81e97"

BRANCHARG = "${@['nobranch=1', 'branch=${BRANCH}'][d.getVar('BRANCH', True) != '']}"
SRC_URI = "${REPO};${BRANCHARG}"

EXTRA_OEMAKE += 'CROSS_COMPILER="${CXX}" -C ${S}'
CXXFLAGS:append = " -std=c++0x"

TARGET_CC_ARCH += "${LDFLAGS}"

do_install() {
    install -d ${D}${bindir}
    install -Dm 0755 ${S}/bootgen ${D}${bindir}
}

FILES:${PN} = "${bindir}/bootgen"

BBCLASSEXTEND = "native nativesdk"
```
assistant