Improve dependencies checks in the build process

- Rename all Find*.cmake files to uppercase, to make things more consistent,
  and fix some issues with them (notably the REQUIRED flag)

- Rename SYSTEMDDAEMON to SYSTEMD and only use the libsystemd instead of
  libsystemd-daemon because it's deprecated for a long time now

- Provide a WITH_* and WITHOUT_* switch for all optional dependencies

- Document things in the INSTALL file

1 files changed, 35 insertions, 0 deletions

diff --git a/cmake/Modules/FindBOTAN.cmake b/cmake/Modules/FindBOTAN.cmake
new file mode 100644
index 0000000..a12bd35
--- /dev/null
+++ b/cmake/Modules/FindBOTAN.cmake
@@ -0,0 +1,35 @@
+# - Find botan
+# Find the botan cryptographic library
+#
+# This module defines the following variables:
+#   BOTAN_FOUND  -  True if library and include directory are found
+# If set to TRUE, the following are also defined:
+#   BOTAN_INCLUDE_DIRS  -  The directory where to find the header file
+#   BOTAN_LIBRARIES  -  Where to find the library file
+#
+# For conveniance, these variables are also set. They have the same values
+# than the variables above.  The user can thus choose his/her prefered way
+# to write them.
+#   BOTAN_LIBRARY
+#   BOTAN_INCLUDE_DIR
+#
+# This file is in the public domain
+
+find_path(BOTAN_INCLUDE_DIRS NAMES botan/botan.h
+  PATH_SUFFIXES botan-1.11
+  DOC "The botan include directory")
+
+find_library(BOTAN_LIBRARIES NAMES botan botan-1.11
+  DOC "The botan library")
+
+# Use some standard module to handle the QUIETLY and REQUIRED arguments, and
+# set BOTAN_FOUND to TRUE if these two variables are set.
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(BOTAN REQUIRED_VARS BOTAN_LIBRARIES BOTAN_INCLUDE_DIRS)
+
+if(BOTAN_FOUND)
+  set(BOTAN_LIBRARY ${BOTAN_LIBRARIES})
+  set(BOTAN_INCLUDE_DIR ${BOTAN_INCLUDE_DIRS})
+endif()
+
+mark_as_advanced(BOTAN_INCLUDE_DIRS BOTAN_LIBRARIES)