build: CMAKE_INSTALL_PREFIX value fix

# feat: (new feature for the user, not a new feature for build script)
# fix: (bug fix for the user, not a fix to a build script)
# docs: (changes to the documentation)
# style: (formatting, missing semi colons, etc; no production code change)
# perf: (performance adjustments)
# refactor: (refactoring production code, no logical changes eg. renaming a variable)
# test: (adding missing tests, refactoring tests; no production code change)
# chore: (updating grunt tasks etc; no production code change)
# ci: (ci configuration changes)
# build: (build configuration changes)
#
# fixing a build failure should have the same tag as the tag used to submit the code we are fixing

Author: rpadrela

superbuild/CMakeLists.txt

@@ -19,7 +19,7 @@ ExternalProject_Add(decimal_for_cpp
         SOURCE_DIR ${CMAKE_SOURCE_DIR}/..
         DEPENDS boost
         CMAKE_ARGS
-            -DCMAKE_INSTALL_PREFIX=<INSTALL_DIR>
+            -DCMAKE_INSTALL_PREFIX=${CMAKE_BINARY_DIR}/install
             -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
         LOG_DOWNLOAD ON
         LOG_CONFIGURE ON