Fix Linux build errors.

DCDBLib/Makefile

@@ -22,7 +22,7 @@ PUBHEADERS = $(shell find include -type f -iname "*.h")
 PRIVHEADERS = $(shell find include_internal -type f -iname "*.h")
 
 # External libraries to link against
-LIBS = -L$(DCDBDEPLOYPATH)/lib/ -lcassandra -lboost_random -lboost_system -lboost_date_time -lboost_regex -luv
+LIBS = -L$(DCDBDEPLOYPATH)/lib/ -lcassandra -lboost_random -lboost_system -lboost_date_time -lboost_regex -luv -pthread
 
 # Dynamic library building differs between Linux/BSD and MacOS
 OS = $(shell uname)

DCDBLib/include/c_api.h

@@ -64,7 +64,7 @@ DCDB_C_RESULT dcdbQuerySumMultipleThreaded(
     time_t start,
     time_t end,
     DCDB_C_OPTIONS options,
-    int numThreads
+    unsigned int numThreads
 );
 
 #ifdef __cplusplus

DCDBLib/src/c_api.cpp

@@ -301,7 +301,7 @@ DCDB_C_RESULT dcdbQuerySumMultipleThreaded(
     time_t start,
     time_t end,
     DCDB_C_OPTIONS options,
-    int numThreads
+    unsigned int numThreads
 )
 {
   unsigned int i;