fix: alpine unable to find mutux impl

Author: losh11

0.21/alpine/Dockerfile

@@ -17,7 +17,7 @@ RUN mkdir -p ${BERKELEYDB_PREFIX}
 
 WORKDIR /${BERKELEYDB_VERSION}/build_unix
 
-RUN ../dist/configure --enable-cxx --disable-shared --with-pic --prefix=${BERKELEYDB_PREFIX}
+RUN CFLAGS=-Wno-error=implicit-function-declaration ../dist/configure --enable-cxx --disable-shared --with-pic --prefix=${BERKELEYDB_PREFIX}
 RUN make -j4
 RUN make install
 RUN rm -rf ${BERKELEYDB_PREFIX}/docs