cmake: use `CMAKE_INSTALL_SYSCONFDIR`

Replace `${CMAKE_INSTALL_PREFIX}/etc` with
`${CMAKE_INSTALL_SYSCONFDIR}`.

It makes the install step honor the `--prefix` option.

Fixes #1118

1 files changed, 2 insertions, 2 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 204cb1b..0173bf8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -449,10 +449,10 @@ if(OPENSSLDIR STREQUAL "")
         if(WIN32)
                 set(OPENSSLDIR "C:/Windows/libressl/ssl")
         else()
-                set(OPENSSLDIR "${CMAKE_INSTALL_PREFIX}/etc/ssl")
+                set(OPENSSLDIR "${CMAKE_INSTALL_SYSCONFDIR}/ssl")
         endif()
 
-        set(CONF_DIR "${CMAKE_INSTALL_PREFIX}/etc/ssl")
+        set(CONF_DIR "${CMAKE_INSTALL_SYSCONFDIR}/ssl")
 else()
         set(CONF_DIR "${OPENSSLDIR}")
 endif()