configure: Make the libjpeg soname check depend on the header check.
diff --git a/configure.ac b/configure.ac
index bd64583..d4e4f12 100644
--- a/configure.ac
+++ b/configure.ac
@@ -992,6 +992,12 @@
     WINE_CHECK_SONAME(crypto,BIO_new_socket)
 fi
 
+dnl **** Check for libjpeg ****
+if test "$ac_cv_header_jpeglib_h" = "yes"
+then
+    WINE_CHECK_SONAME(jpeg,jpeg_start_decompress)
+fi
+
 dnl **** Check for gcc specific options ****
 
 AC_SUBST(EXTRACFLAGS,"")
@@ -1140,7 +1146,6 @@
 WINE_CHECK_SONAME(freetype,FT_Init_FreeType,,,[$X_LIBS])
 WINE_CHECK_SONAME(GL,glXQueryExtension,,,[$X_LIBS $X_EXTRA_LIBS])
 WINE_CHECK_SONAME(txc_dxtn,fetch_2d_texel_rgba_dxt1)
-WINE_CHECK_SONAME(jpeg,jpeg_start_decompress)
 
 
 dnl **** Check for functions ****