lmdb rebuild for appstream

no cmake or pc file available, which appstream looks for, added one from Gentoo
libsigc++ 2.10.2
meson 0.51.0

libsigc++/PKGBUILD

@@ -1,15 +1,15 @@
 
 pkgbase=libsigc++
 pkgname=('libsigc++' 'libsigc++-docs')
-pkgver=2.10.1
-pkgrel=2
+pkgver=2.10.2
+pkgrel=1
 arch=('x86_64')
 license=('LGPL')
 url="http://libsigc.sourceforge.net/"
 makedepends=('gcc-libs')
 options=('!libtool' '!emptydirs')
 source=("https://ftp.gnome.org/pub/GNOME/sources/libsigc++/2.10/libsigc++-${pkgver}.tar.xz")
-sha256sums=('c9a25f26178c6cbb147f9904d8c533b5a5c5111a41ac2eb781eb734eea446003')
+sha256sums=('b1ca0253379596f9c19f070c83d362b12dfd39c0a3ea1dd813e8e21c1a097a98')
 
 build() {
   cd libsigc++-${pkgver}

lmdb/PKGBUILD

@@ -1,14 +1,16 @@
 
 pkgname=lmdb
 pkgver=0.9.23
-pkgrel=1
+pkgrel=2
 pkgdesc="Fast, ultra-compact key-value embedded data store developed by Symas for the OpenLDAP Project."
-url="http://symas.com/mdb"
+url="https://symas.com/lmdb/"
 license=('custom:OpenLDAP')
 depends=('gcc')
 arch=('x86_64')
-source=("https://github.com/LMDB/lmdb/archive/LMDB_${pkgver}.tar.gz")
-md5sums=('5a57d029e6829e95d159bb6f689880d3')
+source=("https://github.com/LMDB/lmdb/archive/LMDB_${pkgver}.tar.gz"
+        'lmdb.pc')
+md5sums=('5a57d029e6829e95d159bb6f689880d3'
+         'cd669dad02d583d4774e81d0fc64b004')
 
 build() {
   cd lmdb-LMDB_${pkgver}/libraries/liblmdb
@@ -22,5 +24,7 @@ package() {
 
   make DESTDIR=${pkgdir} prefix=/usr install
   mv $pkgdir/usr/man $pkgdir/usr/share/man
+
   install -m644 -D LICENSE ${pkgdir}/usr/share/licenses/${pkgname}/LICENSE
+  install -m644 -D ${srcdir}/lmdb.pc ${pkgdir}/usr/lib/pkgconfig/lmdb.pc
 }

lmdb/lmdb.pc

@@ -0,0 +1,11 @@
+prefix=@prefix@
+exec_prefix=@prefix@
+libdir=${prefix}/@libdir@
+includedir=${prefix}/include
+
+Name: liblmdb
+Description: Lightning Memory-Mapped Database
+URL: https://symas.com/products/lightning-memory-mapped-database/
+Version: @PACKAGE_VERSION@
+Libs: -L${libdir} -llmdb
+Cflags: -I${includedir} 

meson/PKGBUILD

@@ -1,6 +1,6 @@
 
 pkgname=meson
-pkgver=0.50.1
+pkgver=0.51.0
 pkgrel=1
 pkgdesc="Open source build system meant to be both extremely fast, and as user friendly as possible."
 arch=('x86_64')
@@ -9,7 +9,7 @@ license=('GPL')
 depends=('ninja' 'python3-setuptools')
 makedepends=('googletest' 'sdl2' 'itstool')
 source=("https://github.com/mesonbuild/meson/releases/download/${pkgver}/${pkgname}-${pkgver}.tar.gz")
-md5sums=('24a6527796115828d2ebc75880e18d62')
+md5sums=('a091995861e0bc23e3c856b0c8d1ef90')
 
 build() {
   cd ${pkgname}-${pkgver}