diff --git a/gmp/PKGBUILD b/gmp/PKGBUILD
index 76d3fa22..8ca159bf 100644
--- a/gmp/PKGBUILD
+++ b/gmp/PKGBUILD
@@ -3,7 +3,7 @@
 pkgbase=gmp
 pkgname=('gmp' 'gmp-devel')
 pkgver=6.1.0
-pkgrel=3
+pkgrel=4
 pkgdesc="A free library for arbitrary precision arithmetic"
 groups=('libraries')
 arch=('i686' 'x86_64')
@@ -17,6 +17,7 @@ sha256sums=('68dadacce515b0f8a54f510edf07c1b636492bcdb8e8d54c56eb216225d16989'
             'SKIP'
             '3e25844051fe1bd3d3137f0435978024076a92ddbf084ec47732cf5c816c74dd'
             'c1ff80a8643a362f44be680a5430dca6f4ec16d84a4068d344a24b8d181e5436')
+validpgpkeys=('5972C48224C1E7E62AA0275D1150EE33C1A000B0')   # Marco Bodrato
 
 prepare() {
   cd "${srcdir}/${pkgname}-${pkgver}"
diff --git a/mpc/PKGBUILD b/mpc/PKGBUILD
index f4966115..80b8e551 100644
--- a/mpc/PKGBUILD
+++ b/mpc/PKGBUILD
@@ -2,7 +2,7 @@
 
 pkgname=('mpc' 'mpc-devel')
 pkgver=1.0.3
-pkgrel=2
+pkgrel=3
 pkgdesc='Multiple precision complex arithmetic library'
 groups=('libraries')
 url='http://www.multiprecision.org'
@@ -11,12 +11,14 @@ arch=('i686' 'x86_64')
 depends=('gmp>=5.0' 'mpfr')
 makedepends=('gmp-devel' 'mpfr-devel')
 install=mpc.install
-source=("http://www.multiprecision.org/mpc/download/${pkgname}-${pkgver}.tar.gz"
+options=('!emptydirs')
+source=(http://www.multiprecision.org/mpc/download/${pkgname}-${pkgver}.tar.gz{,.sig}
         mpc-1.0.1-msys2.patch)
 sha1sums=('b8be66396c726fdc36ebb0f692ed8a8cca3bcc66'
+          'SKIP'
           '0fa851f841aa3d38d9688941ee46317c916da925')
+validpgpkeys=('AD17A21EF8AED8F1CC02DBD9F7D5C9BF765C61E3')  # Andreas Enge
 
-options=('!emptydirs')
 
 prepare() {
   cd "${srcdir}/${pkgname}-${pkgver}"
diff --git a/mpfr/PKGBUILD b/mpfr/PKGBUILD
index 2431274f..bd90a33e 100644
--- a/mpfr/PKGBUILD
+++ b/mpfr/PKGBUILD
@@ -8,7 +8,7 @@ if [ -n "${_patchlevel}" ]; then
   pkgver+=.${_patchlevel}
 fi
 #pkgver=${_pkgver}
-pkgrel=2
+pkgrel=3
 pkgdesc="Multiple-precision floating-point library"
 arch=('i686' 'x86_64')
 url="http://www.mpfr.org/"
@@ -18,6 +18,7 @@ makedepends=('gmp-devel>=5.0')
 source=(http://www.mpfr.org/mpfr-current/mpfr-${_pkgver}.tar.xz{,.asc}
         mpfr-3.1.4-1.src.patch
         mpfr-3.1.2-msys2.patch)
+validpgpkeys=('07F3DBBECC1A39605078094D980C197698C3739D')
 sha256sums=('761413b16d749c53e2bfd2b1dfaa3b027b0e793e404b90b5fbaeef60af6517f5'
             'SKIP'
             '976a88585adeb90ab15646ce6de724c01caa7a6f763cc0477a925896db77165c'
diff --git a/readline/PKGBUILD b/readline/PKGBUILD
index 273351e6..f1a8f8bf 100644
--- a/readline/PKGBUILD
+++ b/readline/PKGBUILD
@@ -5,7 +5,7 @@ pkgname=('libreadline' 'libreadline-devel')
 _basever=6.3
 _patchlevel=008 #prepare for some patches
 pkgver=${_basever}.${_patchlevel}
-pkgrel=8
+pkgrel=9
 pkgdesc="GNU readline library"
 arch=('i686' 'x86_64')
 url="http://tiswww.case.edu/php/chet/readline/rltop.html"
@@ -43,6 +43,7 @@ sha256sums=('56ba6071b9462f980c5a72ab0023893b65ba6debb4eeb475d7a563dc65cafd43'
             'SKIP'
             '3bc093cf526ceac23eb80256b0ec87fa1735540d659742107b6284d635c43787'
             'SKIP')
+validpgpkeys=('7C0135FB088AAF6C66C650B9BB5869F064EA74AB') # Chet Ramey
 
 prepare() {
   cd ${srcdir}/${pkgbase}-${_basever}