diff --git a/CMakeLists.txt b/CMakeLists.txt
index b6a3d05..a78c027 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -245,7 +245,7 @@ if (EIGEN3_FOUND)
 endif (EIGEN3_FOUND)
 
 if (LAPACK)
-  find_package(LAPACK QUIET)
+  find_package(LAPACK REQUIRED)
   if (LAPACK_FOUND)
     message("-- Found LAPACK library: ${LAPACK_LIBRARIES}")
   else (LAPACK_FOUND)
@@ -263,7 +263,7 @@ if (SUITESPARSE)
   # built with SuiteSparse support.
 
   # Check for SuiteSparse and dependencies.
-  find_package(SuiteSparse)
+  find_package(SuiteSparse REQUIRED)
   if (SUITESPARSE_FOUND)
     # On Ubuntu the system install of SuiteSparse (v3.4.0) up to at least
     # Ubuntu 13.10 cannot be used to link shared libraries.
@@ -300,7 +300,7 @@ endif (SUITESPARSE)
 # CXSparse.
 if (CXSPARSE)
   # Don't search with REQUIRED as we can continue without CXSparse.
-  find_package(CXSparse)
+  find_package(CXSparse REQUIRED)
   if (CXSPARSE_FOUND)
     # By default, if CXSparse and all dependencies are found, Ceres is
     # built with CXSparse support.
@@ -336,7 +336,7 @@ endif(NOT SUITESPARSE AND NOT CXSPARSE AND NOT EIGENSPARSE)
 # GFlags.
 if (GFLAGS)
   # Don't search with REQUIRED as we can continue without gflags.
-  find_package(gflags 2.2.0)
+  find_package(gflags REQUIRED)
   if (gflags_FOUND)
     if (TARGET gflags)
       message("-- Found Google Flags (gflags) version ${gflags_VERSION}: ${gflags_DIR}")
@@ -537,7 +537,7 @@ else (NOT OPENMP AND NOT TBB AND NOT CXX11_THREADS)
 set_ceres_threading_model("${CERES_THREADING_MODEL}")
 
 if (BUILD_BENCHMARKS)
-  find_package(benchmark QUIET)
+  find_package(benchmark REQUIRED)
   if (benchmark_FOUND)
      message("-- Found Google benchmark library. Building Ceres benchmarks.")
   else()
@@ -782,7 +782,7 @@ if (BUILD_DOCUMENTATION)
   set(CERES_DOCS_INSTALL_DIR "share/doc/ceres" CACHE STRING
       "Ceres docs install path relative to CMAKE_INSTALL_PREFIX")
 
-  find_package(Sphinx QUIET)
+  find_package(Sphinx REQUIRED)
   if (NOT SPHINX_FOUND)
     message("-- Failed to find Sphinx, disabling build of documentation.")
     update_cache_variable(BUILD_DOCUMENTATION OFF)