gnu: Add aws-c-cal.

* gnu/packages/c.scm (aws-c-cal): New variable.
* gnu/packages/patches/aws-c-cal-cmake-prefix.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu/local.mk

@@ -830,6 +830,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/avahi-localstatedir.patch		\
   %D%/packages/patches/avidemux-install-to-lib.patch		\
   %D%/packages/patches/awesome-reproducible-png.patch		\
+  %D%/packages/patches/aws-c-cal-cmake-prefix.patch		\
   %D%/packages/patches/aws-c-event-stream-cmake-prefix.patch  \
   %D%/packages/patches/aws-checksums-cmake-prefix.patch		\
   %D%/packages/patches/azr3.patch				\

gnu/packages/c.scm

@@ -52,6 +52,7 @@ (define-module (gnu packages c)
   #:use-module (gnu packages autotools)
   #:use-module (gnu packages gettext)
   #:use-module (gnu packages pkg-config)
+  #:use-module (gnu packages tls)
   #:use-module (gnu packages xml))
 
 (define-public tcc
@@ -619,3 +620,32 @@ (define-public aws-c-event-stream
 communication.")
     (home-page "https://github.com/awslabs/aws-c-event-stream")
     (license license:asl2.0)))
+
+(define-public aws-c-cal
+  (package
+    (name "aws-c-cal")
+    (version "0.4.5")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url (string-append "https://github.com/awslabs/" name))
+                    (commit (string-append "v" version))))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "04acra1mnzw9q7jycs5966akfbgnx96hkrq90nq0dhw8pvarlyv6"))
+              (patches (search-patches "aws-c-cal-cmake-prefix.patch"))))
+    (build-system cmake-build-system)
+    (arguments
+     '(#:configure-flags
+       '("-DBUILD_SHARED_LIBS=ON")))
+    (propagated-inputs
+     `(("aws-c-common" ,aws-c-common)))
+    (inputs
+     `(("openssl" ,openssl)
+       ("openssl:static" ,openssl "static")))
+    (synopsis "Amazon Web Services Crypto Abstraction Layer")
+    (description "This library provides a C99 wrapper for hash, HMAC, and ECC
+cryptographic primitives for the @acronym{AWS,Amazon Web Services} SDK.")
+    (home-page "https://github.com/awslabs/aws-c-cal")
+    (license license:asl2.0)))

gnu/packages/patches/aws-c-cal-cmake-prefix.patch

@@ -0,0 +1,13 @@
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -10,6 +10,10 @@ endif()
+ 
+ option(BYO_CRYPTO "Set this if you want to provide your own cryptography implementation. This will cause the defaults to not be compiled." OFF)
+ 
++if (DEFINED ENV{CMAKE_PREFIX_PATH})
++    set(CMAKE_PREFIX_PATH $ENV{CMAKE_PREFIX_PATH})
++endif()
++
+ if (DEFINED CMAKE_PREFIX_PATH)
+     file(TO_CMAKE_PATH "${CMAKE_PREFIX_PATH}" CMAKE_PREFIX_PATH)
+ endif()