# This is patch has a pending PR: https://github.com/Blosc/c-blosc/pull/329

--- CMakeLists.txt
+++ CMakeLists.txt
@@ -3,10 +3,9 @@ add_definitions(-DUSING_CMAKE)
 
 set(INTERNAL_LIBS ${PROJECT_SOURCE_DIR}/internal-complibs)
 
-# Hide symbols by default unless they're specifically exported.
-# This makes it easier to keep the set of exported symbols the
-# same across all compilers/platforms.
-set(CMAKE_C_VISIBILITY_PRESET hidden)
+if(HIDE_SYMBOLS)
+  set(CMAKE_C_VISIBILITY_PRESET hidden)
+endif(HIDE_SYMBOLS)
 
 # includes
 set(BLOSC_INCLUDE_DIRS ${BLOSC_INCLUDE_DIRS} ${CMAKE_CURRENT_SOURCE_DIR})